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JPARSEC is a Java library initially developed to implement a complete set ofalgorithms to compute ephemerides. The project started twelve years ago andsoon evolved to also cover astrophysical modelling and outreach. JPARSEC itselfincludes more than 250 000 lines of code, similar or larger than other populartools like Astropy, complemented with models and other projects operationalsince years. The library is focused on being robust, optimized, well writtenand documented, providing a complete set of tools for astronomers, with specialattention to radioastronomy. The projects written using JPARSEC as the corelibrary cover a wide range of fields from models with complete graphical userinterfaces to an ephemerides server with high quality charts, or even anAndroid planetarium. In this Paper I present the main characteristics ofJPARSEC, with special attention to the core library and documentation, and Idescribe the main projects developed based on it.

JPARSEC: a Java package for astronomy with twelve years of development and use