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Greg Miller’s Celestial Programming is an astronomy programming resource site. Its core form is not a SaaS product or commercial developer platform, but a personally maintained collection of algorithms, sample programs, tutorials, and data. The content covers the Sun, Moon, planets, star catalogs, coordinate systems, precession and nutation, rise/transit/set calculations, moon phases, solar eclipse prediction, JPL ephemeris files, Horizons CGI parameters, and more. It is aimed at developers who need to implement astronomical calculation logic themselves.
In terms of functionality and use cases, it is closer to an “astronomical algorithm toolbox” and learning resource library. The site lists a large number of snippets, including Julian Date, RA/Dec and Alt/Az conversion, GMST/GAST, IAU 1976/2006 precession, IAU 1980/2000 nutation, lunar ELP2000, VSOP87/VSOP2013, planetary positions using Kepler’s equation, the solar terminator, and more. Some algorithms clearly state their accuracy and valid date ranges, such as low-precision Sun/Moon positions, planetary approximation calculations for 1800-2050 or 3000BC-3000AD, which is valuable when making engineering trade-offs.
In terms of language support, the text explicitly mentions that VSOP87 is available in multiple programming language versions. Several entries provide JavaScript examples, and there are also star catalogs and the Messier Catalog in JSON format. It does not provide a unified SDK or package-management entry point, so users need to copy, understand, and adapt code from individual pages. Its open-source posture is relatively friendly: the site states that most code is in the public domain, but also notes that some code, data, or images may use other copyright terms or open-source licenses. Therefore, commercial use or redistribution requires page-by-page verification.
No paid plans are shown on the site, so it can generally be regarded as a free public resource. The documentation is strong in professional depth, providing formulas, algorithm sources, accuracy notes, and test data. However, usability is only average: navigation is list-based, and there is no unified quick start, version management, API reference, or engineering integration guide. It is very useful for developers with a background in astronomy or numerical computation, while beginners will need additional background knowledge.
Its strengths are broad coverage, solid material, and a high degree of code openness. It is especially suitable for education, research prototypes, astronomy hobby projects, and applications that need to embed local algorithms. Its drawbacks are that it is not a commercial service and does not offer an SLA, technical support, a unified API, stable versioned releases, or hosted deployment instructions. Some algorithms are approximate implementations and cannot directly replace high-precision ephemeris systems.
The crawled text does not provide information about access from mainland China, payments, or mirrors, so its China accessibility status cannot be determined. If you need a more mature ecosystem, consider Astropy, Skyfield, NASA SPICE/NAIF, or JPL Horizons; for visualization-oriented use cases, Stellarium is also worth considering. If your goal is simply to learn algorithms or port lightweight astronomical calculations, this site remains a very valuable reference source.
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