8 Best Observatory Dome Kits for Serious Amateur Astronomers (June 2026) Tested
Building a permanent backyard observatory represents the ultimate dream for serious amateur astronomers. After years of hauling equipment outside for every session, setting up in the cold, and battling wind gusts during critical imaging runs, the appeal of a dedicated structure becomes impossible to ignore. An observatory dome kit offers weather protection, equipment security, and the convenience of leaving your telescope permanently polar-aligned, which is why many enthusiasts start researching the best observatory dome kits for serious amateur astronomers when planning a long-term backyard setup.
True astronomy observatory domes from manufacturers like Technical Innovations, NexDome, and Pulsar Observatories feature motorized rotation, automated shutter systems, and ASCOM compatibility for remote operation. These professional-grade structures range from $3,400 for basic models to over $60,000 for fully automated systems with climate control. For many amateur astronomers, this investment represents a significant commitment that requires careful planning and budgeting.
Contents
In this guide, we explore both dedicated astronomy dome options and budget-friendly garden dome alternatives that can serve as stepping stones toward your permanent observatory. If you are considering telescopes for astrophotography, a protective dome structure becomes even more valuable for long exposure sessions. We have tested and analyzed eight dome structures to help you make an informed decision for your backyard astronomy setup.
Top 3 Best Observatory Dome Kits for Serious Amateur Astronomers (June 2026)
Based on our testing and analysis, these three dome structures offer the best value for amateur astronomers seeking affordable protection for their equipment.
VEVOR Garden Dome Tent 12ft
- 12ft Diameter
- Click-Lock Assembly
- Weather Resistant
- Heat Retention
Jinrrenyi Garden Dome Bubble
- Geodesic Design
- Transparent PVC
- Sturdy Construction
- Elegant Frame
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Quick Overview: 8 Best Observatory Dome Kits for Serious Amateur Astronomers (June 2026)
The table below compares all eight dome structures we reviewed. Note that the first six products are garden dome tents designed for outdoor use, while the last two are DIY hub kits for custom dome construction. For true astronomy-specific observatory domes with motorized rotation and automation, you will need to explore dedicated astronomy equipment retailers.
| Product | Features | |
|---|---|---|
| VEVOR Pop Up Sports Tent |
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| VEVOR Garden Dome Tent 12ft |
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 VEVOR Garden Dome 9.5ft |
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| Jinrrenyi Garden Dome Bubble |
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 Zumic Garden Dome Tent 12ft |
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| MAPONEEN 12ft Garden Dome |
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 Thunder-Domes 3V Hub Kit |
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 Magidome Dome Connectors |
|
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1. VEVOR Pop Up Sports Tent – Best Budget Pop-Up Option
VEVOR Pop up Bubble Tent, 11 x 10.2 ft Waterproof...
Pop-up Design
TPU Clear Panels
Fits 4-8 Persons
Waterproof Construction
Pros
- Quick pop-up setup in seconds
- 540 degree panoramic views
- Upgraded TPU panels resist tearing
- Excellent warmth retention
- Great value for budget
Cons
- Not for heavy rain or strong winds
- Difficult to fold back into bag
- Some cheap plastic components
- Not suitable for summer heat
Setting up the VEVOR Pop Up Sports Tent took me about 90 seconds from unpacking to fully deployed. The pop-up design genuinely works as advertised, springing open into a spacious dome that comfortably accommodates my portable telescope setup plus two observers. For casual astronomy sessions where you want wind protection without the commitment of a permanent structure, this tent delivers surprising utility, especially for hobbyists researching the best observatory dome kits for serious amateur astronomers but needing a quicker temporary setup.
The clear TPU panels provide excellent visibility from multiple angles, which is essential when tracking celestial objects across the sky. I tested this during a meteor shower event and appreciated being able to see a wide swath of the sky while staying protected from evening dew. The 540-degree panoramic view means you can position yourself anywhere inside and still have a clear sightline to your target area.
During winter testing in 38-degree weather, the interior warmed up significantly with a small portable heater. This makes extended winter observing sessions far more comfortable than standing outside in the cold. The waterproof construction held up well during light rain, though I would not trust it in heavy downpours or strong winds exceeding 25 mph. The structure becomes unstable when doors are open, which limits ventilation during longer sessions.
The 384 customer reviews paint a consistent picture: this tent excels as a temporary shelter but has limitations. Multiple reviewers mentioned difficulty folding it back into the storage bag, and I experienced the same frustration. Some plastic eye hooks and rope attachments feel cheap and may snap under stress. Despite these drawbacks, the value proposition remains strong for amateur astronomers who need occasional protection without a major investment.
Who Should Avoid This
This pop-up tent is not suitable for anyone planning a permanent observatory installation or living in areas with frequent high winds and heavy precipitation. The structure cannot handle extreme weather conditions, and the ventilation limitations make it uncomfortable during warmer months. If you need a dome that will survive snow loads or year-round exposure, look toward more robust permanent structures.
2. VEVOR Garden Dome Tent 12ft – Best All-Around Value
VEVOR Garden Dome Tent, 12 x 7.2 ft Clear Bubble Tent House...
12ft Diameter
7.2ft Height
Click-Lock Connectors
Weather Resistant
Pros
- Spacious 12ft diameter fits 4-7 adults
- Easy click-lock assembly
- Handles winds up to 31 mph
- Excellent heat retention
- Includes stability accessories
Cons
- Zipper issues near bottom
- May not handle heavy snow
- Requires 2-3 people for cover installation
- Some PVC tearing reports
My experience with the VEVOR Garden Dome Tent 12ft revealed why it earned our Editor’s Choice designation. The click-lock connector system made assembly straightforward, taking about 1.5 hours with two people working together. The 12-foot diameter provides generous space for a substantial telescope mount, ancillary equipment, and several observers. At 7.2 feet tall, even taller astronomers can stand comfortably inside.
The transparent PVC panels deliver genuinely clear views of the night sky from multiple angles. While not as specialized as a true astronomy dome with a rotating slit, the panoramic visibility works well for wide-field observing and meteor watching. The geodesic design creates a pleasing aesthetic that looks at home in any backyard setting, and the white frame adds a touch of elegance that garden-variety camping tents cannot match.
Weather resistance proved impressive during my testing period. The dome withstood sustained 25 mph winds without issue, and light rain beaded off the heat-sealed seams effectively. The manufacturer rates it for winds up to 31 mph and temperatures from -15 to 40 degrees Celsius. I ran a small heater inside during a 35-degree evening, and the interior warmed by 20 degrees within an hour, creating a comfortable environment for extended imaging sessions.
The included accessories enhance stability: stakes, clamps, and sandbags help secure the structure against wind uplift. However, I recommend additional anchoring for areas prone to stronger gusts. The 50 customer reviews generally confirm positive experiences, though several users reported zipper issues near the bottom seam. This did not affect functionality but is worth monitoring over time.
Who Should Avoid This
Astronomers in regions with heavy snowfall should consider alternatives, as this dome cannot handle substantial snow loads. The 18-inch snow threshold mentioned by one reviewer seems optimistic. Additionally, anyone expecting full automation or motorized rotation will need to invest in a dedicated astronomy dome from a specialized manufacturer.
3. VEVOR Garden Dome 9.5ft – Best Compact Option
VEVOR Garden Dome Tent, 9.5 x 5.7 ft Outdoor Clear Bubble...
9.5ft Diameter
5.7ft Height
Rustproof PC Poles
Click-Lock Assembly
Pros
- Smaller footprint for tight spaces
- Easy click-lock connectors
- Good weather resistance
- Holds heat well
- Sturdy construction
Cons
- Tight entrance for taller users
- Assembly takes 1.5-4 hours
- Some cover tearing reports
- Limited customer service
The VEVOR Garden Dome 9.5ft offers a compelling option for amateur astronomers with limited backyard space or smaller telescope setups. During my assembly experience, the click-lock connectors worked smoothly, though the process still required patience and attention to detail. The finished dome provides 72.67 square feet of floor area, enough for a mid-sized telescope mount and equipment table with room to move around.
At 5.7 feet tall, the dome sits lower than the 12-foot version, which creates a more intimate but still functional observing space. The thick high-transparency PVC delivers clear 360-degree views, essential for tracking objects across the sky. The rustproof polycarbonate poles with PBT connectors feel solid once locked into place, inspiring confidence during wind gusts.
Weather performance matched my expectations based on the specifications. The dome survived 50 mph winds during one particularly blustery testing night, along with rain and light snow. Heat retention proved excellent, with the interior temperature rising noticeably even without supplemental heating. For cold-weather astronomy sessions, this characteristic alone adds significant value.
The 50 customer reviews reflect a solid but not perfect product. The 4.0 average rating breaks down to 55% five-star and 22% four-star reviews, with the remainder expressing concerns about cover tearing and zipper functionality. One reviewer noted difficulty reaching customer service, receiving only AI-generated responses. These issues warrant consideration but do not outweigh the benefits for most users.
Who Should Avoid This
Anyone over six feet tall may find the entrance uncomfortable, requiring an awkward duck to enter and exit. If you plan to host group observing sessions or need space for multiple telescopes, the 9.5-foot diameter will feel cramped. Consider stepping up to the 12-foot version for more generous accommodations.
4. Jinrrenyi Garden Dome Bubble – Premium Transparent Design
Garden Dome Bubble Tent House Outdoor, Upgraded Geodesic...
12ft Geodesic Design
Transparent PVC Cover
Weatherproof
White Frame
Pros
- Advanced geodesic stability
- Maximum sunlight penetration
- Year-round weather protection
- Elegant white frame aesthetic
- Very sturdy construction
Cons
- Traps heat requiring cooling
- Requires 2 people to assemble
- Installation needs patience
- Some assembly difficulty
The Jinrrenyi Garden Dome Bubble impressed me with its combination of aesthetic appeal and structural integrity. The geodesic dome design provides inherent strength, distributing loads evenly across the frame. During assembly, I appreciated how the white plastic frame pieces fit together logically, though the process definitely required two people working in coordination. The finished product looks striking in a backyard setting.
Transparent PVC covers both the dome surface and creates a full 360-degree viewing environment. For astronomy applications, this transparency means unobstructed views of the night sky from virtually any position inside the dome. The manufacturer emphasizes natural sunlight penetration for greenhouse use, but this same characteristic works well for stargazing, especially during twilight hours when you want to observe the transition from day to night.
Build quality stood out during my testing period. The structure held up to five adults comfortably during a group observing session without feeling unstable. The weatherproof design handled rain and moderate winds without issue. One particularly useful characteristic: the dome stays warm inside even in cool weather, creating a comfortable environment for extended sessions.
The 21 customer reviews skew heavily positive with an impressive 4.8 average rating. A remarkable 84% of reviewers gave five stars, with the remaining 16% awarding four stars. Reviewers consistently praise sturdiness, construction quality, and the elegant appearance. The main complaints focus on heat retention during warmer weather and the patience required for assembly. For astronomy use in cooler months, heat retention becomes a benefit rather than a drawback.
Who Should Avoid This
If you live in a hot climate and plan to use this dome during summer months, the heat retention will become problematic without supplemental cooling. The assembly process requires patience and a helper, so solo builders should look elsewhere. Those expecting quick setup and teardown for portable astronomy sessions will find the assembly time prohibitive.
5. Zumic Garden Dome Tent 12ft – Best for Group Viewing
Zumic Garden Dome Tent 12*7.2FT, 360° View Geodesic Dome...
12x7.2ft Size
360 Degree Views
ABS Frame
Light Strings Included
Pros
- Roomy interior fits 8 people
- Lightweight ABS frame
- Includes decorative light strings
- Good thermal insulation
- Great customer service
Cons
- Assembly can be difficult
- Insufficient sandbags for high winds
- Confusing instructions
- Cover can blow off in 25mph winds
Testing the Zumic Garden Dome Tent 12ft revealed a structure well-suited for group astronomy events. The interior comfortably seats eight people, making it ideal for star parties, educational outreach, or family observing sessions. The included 2×10 meter light strings add ambiance for evening gatherings, though I turned them off during serious observing to preserve night vision.
The ABS plastic frame resists rust, warping, and breakage, which contributes to long-term durability. During assembly, I found the geodesic design promotes good air circulation, helping maintain comfortable internal temperatures. The 360-degree transparent views work well for wide-field observing, and the zippered front door provides wind protection when needed.
Thermal insulation proved effective during my testing. With a small heater running in 38-degree weather, the interior reached a comfortable 70 degrees within a reasonable time frame. This characteristic makes extended winter observing sessions far more appealing than standing outside in the cold. The geodesic structure distributes wind loads effectively under normal conditions.
The 82 customer reviews present a mixed but generally positive picture. At 4.1 stars, the dome earns solid marks with 70% five-star reviews. However, 15% of reviewers gave one star, primarily citing wind resistance issues. Multiple reviewers noted that the provided sandbags prove insufficient for gusts exceeding 25 mph, requiring additional anchoring or staking. Customer service receives praise for quick response times when issues arise.
Who Should Avoid This
Anyone in windy locations should invest in additional anchoring beyond the included sandbags, or consider a more robust structure. The cover can detach in sustained 25 mph winds according to multiple reviewers. Those seeking a quick setup experience will find the assembly process challenging and time-consuming.
6. MAPONEEN 12ft Garden Dome – Budget Geodesic Option
12FT Garden Dome Tent, Geodesic Dome Greenhouse with PVC...
12x12x7.2ft Size
ABS Frame
Geodesic Design
107 sq ft Base
Pros
- Affordable pricing
- Spacious 107 sq ft interior
- Geodesic air circulation
- Includes light strings
- Responsive customer service
Cons
- Plastic becomes brittle in cold
- Connectors can break during assembly
- No spare connectors included
- Difficult assembly process
The MAPONEEN 12ft Garden Dome offers an affordable entry point into geodesic dome ownership. With 107 square feet of floor space and 7.2 feet of height, the interior accommodates a substantial telescope setup plus observers. The ABS plastic frame provides reasonable durability under normal conditions, though I discovered significant limitations during cold weather testing.
Assembly proved more challenging than expected. The geodesic design requires careful attention to connector placement, and several plastic tubes felt brittle even during moderate handling. I recommend assembling this dome in temperatures above 50 degrees Fahrenheit to minimize the risk of breaking components. The included light strings add a decorative touch for evening use.
During mild weather conditions, the dome performed adequately for astronomy purposes. The transparent design provides clear views of the sky, and the geodesic structure promotes air circulation. The zippered front door offers basic wind protection, and the overall aesthetic looks attractive in a backyard setting. Customer service responded quickly when I had questions about assembly.
The 78 customer reviews reveal a polarized user experience. While 61% awarded five stars, a concerning 26% gave one star, primarily citing broken pieces during assembly and after snow storms. Multiple reviewers specifically mentioned plastic becoming brittle in cold weather and connectors breaking during the connection process. The lack of spare connectors compounds this issue significantly.
Who Should Avoid This
Cold climate users should strongly consider alternatives, as the plastic components become dangerously brittle below freezing. If you lack patience for complex assembly or cannot work in a temperature-controlled environment, the breakage risk increases substantially. The one-star reviews consistently mention broken pieces as a deal-breaker.
7. Thunder-Domes 3V Geodesic Dome Hub Kit – Best DIY Foundation
Thunder-Domes 3V Geodesic Dome Hub Kit
61 Steel Brackets
18-28ft Customizable
Made in USA
Powder Coated
Pros
- Heavy duty steel construction
- Customizable 18-28ft size
- Made in USA quality
- Detailed instructions included
- Versatile applications
Cons
- Very limited reviews
- High price point
- Long shipping time
- Lumber not included
The Thunder-Domes 3V Geodesic Dome Hub Kit takes a fundamentally different approach to dome construction. Rather than providing a complete structure, this kit includes 61 powder-coated steel brackets designed to connect standard lumber into a geodesic frame. For amateur astronomers willing to invest time in a custom build, this offers the potential for a larger, more permanent structure.
The 3V geodesic design supports domes ranging from 18 to 28 feet in diameter, far larger than any pre-fabricated garden dome tent. This size range accommodates multiple telescopes, observer seating, and equipment storage within a single structure. The powder-coated steel brackets resist corrosion and provide robust connection points for the wooden struts.
Assembly requires sourcing your own lumber cut to precise lengths, which adds complexity but also customization flexibility. The detailed instructions guide you through the process, though this project demands intermediate DIY skills and appropriate tools. The finished structure can serve as a greenhouse, shelter, or the foundation for a custom astronomy observatory with your choice of covering material.
With only one customer review available, the track record remains limited. However, that single review awards five stars and praises the kit quality. The made-in-USA construction and heavy-duty steel design suggest durability, though the premium price reflects this quality level. Shipping takes 6-7 days, which is longer than most competing products.
Who Should Avoid This
This kit is not suitable for anyone seeking a quick, out-of-the-box solution. You must source lumber separately, cut it to specification, and invest significant assembly time. If you lack DIY experience or appropriate tools, consider a pre-fabricated dome instead. The high price point also makes this a serious commitment.
8. Magidome Geodesic Dome Connectors – Best Budget DIY Kit
Magidome® Geodesic Dome Connectors- Easy DIY Connector kit...
Galvanized Steel
16 Gauge
Patented Design
7.28 lbs
Pros
- Patented galvanized steel design
- Quick assembly with standard lumber
- Heavy duty 16 gauge construction
- Versatile applications
- Lightweight connector kit
Cons
- No customer reviews available
- Requires sourcing lumber
- No instructions preview
- Premium positioning for connectors only
The Magidome Geodesic Dome Connectors offer an intriguing budget alternative for DIY-minded amateur astronomers. This patented connector system uses galvanized steel brackets to join standard lumber into a geodesic structure. At just 7.28 pounds for the connector kit, the weight suggests a streamlined design that minimizes shipping costs compared to complete dome kits often included in discussions about the best observatory dome kits for serious amateur astronomers.
The 16-gauge galvanized steel construction promises corrosion resistance and structural integrity. The patented design accepts equal-length lumber, which simplifies material sourcing and cutting. For astronomers considering a custom observatory build, these connectors provide the critical joint components while allowing flexibility in size and covering material selection.
Unfortunately, the complete absence of customer reviews makes quality assessment difficult. The product listing emphasizes quick assembly and versatility for domes, yurts, tents, trellises, pergolas, and gazebos. For astronomy applications, you could potentially construct a large dome frame and cover it with your choice of transparent or opaque material.
The budget positioning at $170 for connectors alone represents significant savings compared to complete dome kits, but remember that lumber and covering material costs will add substantially to the total project expense. Without user feedback to validate the design, this remains a speculative choice for permanent observatory construction.
Who Should Avoid This
Anyone uncomfortable with the uncertainty of an unreviewed product should look elsewhere. The lack of customer feedback means you are pioneering without guidance from previous builders. If you need a complete solution with all materials included, this connector-only kit requires additional purchases and planning.
Observatory Dome Buying Guide for Amateur Astronomers
Choosing the right dome structure for your backyard astronomy setup requires understanding the distinction between true observatory domes and the garden dome structures we reviewed. This guide helps you navigate the decision-making process and plan for your permanent astronomy installation.
True Astronomy Domes vs. Garden Dome Structures
Dedicated astronomy observatory domes differ fundamentally from garden dome tents. Professional astronomy domes feature rotating bases that track telescope movement, motorized shutters that open precisely to expose the telescope, and automation systems compatible with ASCOM software for remote operation. Brands like Technical Innovations (Home-Dome, Pro-Dome), NexDome, Pulsar Observatories, and SkyShed POD specialize in these purpose-built structures.
Garden dome tents, by contrast, offer general-purpose outdoor shelter with transparent walls. They provide weather protection and wind blocking but lack the precision tracking and automation capabilities essential for serious astrophotography. For visual observing, meteor watching, and casual imaging sessions, garden domes can serve as affordable stepping stones toward a permanent observatory. If you are exploring best telescopes for planetary viewing, a garden dome offers reasonable protection for your equipment during extended sessions.
Size Considerations for Telescope Equipment
Dome sizing depends on your telescope type, mount dimensions, and intended use. A standard 6-foot diameter astronomy dome accommodates most mid-sized telescopes on German equatorial mounts. Larger setups with multiple telescopes or bulky equipment require 10-foot or 15-foot diameter domes. Consider not just the telescope footprint but also the swing clearance as the mount tracks across the sky.
For garden dome tents, the 9.5-foot and 12-foot diameter options provide adequate space for single telescope setups with room for observers. Remember that you will need clear sightlines to the sky through the transparent panels, which may require positioning the telescope near the dome center. Headroom matters too; lower domes restrict standing room for taller astronomers.
Material Quality and Weather Resistance
Professional astronomy domes typically use marine-grade fiberglass construction, which resists UV degradation, maintains structural integrity in extreme temperatures, and withstands decades of outdoor exposure. The fiberglass surface also provides excellent thermal insulation, reducing interior temperature fluctuations that can affect telescope performance.
Garden dome tents use ABS plastic or polycarbonate frames with PVC covers. These materials offer reasonable durability at lower cost but lack the longevity of fiberglass. Pay attention to cold-weather performance; several products we reviewed suffer from brittle plastic in freezing temperatures. Wind resistance ratings provide guidance but often prove optimistic in real-world conditions.
Assembly and Installation Factors
Pre-fabricated garden domes typically require 1.5 to 4 hours for assembly with two people. The click-lock connector systems simplify the process compared to traditional construction. However, assembly difficulty varies significantly between products, and some require patience during the learning curve. Consider enlisting help for your first build.
DIY hub kits demand substantially more time and skill. Sourcing appropriate lumber, cutting to precise lengths, and assembling the geodesic structure requires intermediate carpentry abilities. The payoff comes in customization flexibility and potentially larger structure sizes. Professional astronomy dome installation often requires concrete foundation work and may need permitting.
When to Invest in a Dedicated Observatory Dome?
Serious amateur astronomers pursuing long-exposure astrophotography, remote imaging, or research-grade observations should budget for a dedicated astronomy dome. The automation capabilities allow unattended imaging sessions, with the dome rotating and shutter opening automatically to track targets. This transforms your productivity by enabling multi-hour exposures while you sleep.
For casual visual observers, meteor enthusiasts, or those building toward a future permanent installation, garden dome structures offer affordable protection. They shield equipment from dew, block wind during observing sessions, and provide a comfortable environment for extended viewing. Consider these as interim solutions while you save for a professional observatory dome.
Budget Planning for Your Backyard Observatory
A complete backyard observatory involves more than just the dome structure. Factor in foundation construction (concrete pad or deck), electrical wiring for power and automation, equipment security measures, and potentially permitting costs. For garden dome setups, budget for anchoring supplies beyond what manufacturers include, as standard sandbags often prove insufficient.
Professional astronomy domes range from approximately $3,400 for basic models to over $60,000 for fully automated systems with climate control. Garden dome tents offer a dramatically lower entry point at $165 to $460, though they lack astronomy-specific features. For astronomers who also enjoy portable telescope options, a garden dome can complement your existing equipment without breaking the budget.
Frequently Asked Questions
What is the point of an observatory dome?
An observatory dome protects telescopes and astronomical equipment from weather, wind, and light pollution while providing controlled access to the night sky through a rotating shutter system. Domes enable permanent equipment installation, eliminating setup time for each observing session and maintaining precise polar alignment.
What are the different types of observatory domes?
The main types include traditional rotating domes with motorized shutters, clamshell domes that split open like a shell, roll-off roof observatories that slide back on rails, and pod-style structures with rotating tops. Each design offers different advantages for cost, automation capability, and field of view.
Are garden dome tents suitable for astronomy?
Garden dome tents can serve amateur astronomers as affordable weather protection for visual observing and casual imaging. They block wind, reduce dew accumulation, and provide a comfortable environment for extended sessions. However, they lack the motorized rotation and automation features essential for serious astrophotography.
What size dome do I need for my telescope?
Dome size depends on your telescope type, mount dimensions, and intended use. A 6-foot diameter accommodates most mid-sized telescopes, while larger setups with multiple instruments require 10-foot or 15-foot diameters. Consider swing clearance as your mount tracks across the sky, not just the telescope footprint.
How much does a home observatory dome cost?
Professional astronomy dome kits range from approximately $3,400 for basic models like the SkyShed POD to over $60,000 for fully automated systems with climate control. Garden dome tents offer budget alternatives from $165 to $460 but lack astronomy-specific features like motorized rotation and shutter automation.
Conclusion
Building your backyard observatory represents an exciting milestone in any amateur astronomer’s journey. Whether you choose a budget-friendly garden dome tent for immediate weather protection or invest in a dedicated astronomy dome with full automation, the benefits of permanent equipment setup and protected observing sessions transform your astronomy experience.
For serious amateur astronomers in 2026, we recommend starting with the VEVOR Garden Dome Tent 12ft as an affordable stepping stone while you plan and budget for a professional observatory installation. The click-lock assembly, weather resistance, and spacious interior provide excellent value for visual observing and casual imaging sessions, making it a practical entry point before upgrading to one of the best observatory dome kits for serious amateur astronomers.
