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The Astropy Project

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The Astropy Project is a community effort to develop a core package for astronomy using the Python programming language and improve usability, interoperability, and collaboration between astronomy Python packages. The core astropy package contains functionality aimed at professional astronomers and astrophysicists, but may be useful to anyone developing astronomy software. The Astropy Project also includes "affiliated packages," Python packages that are not necessarily developed by the core development team, but share the goals of Astropy, and often build from the core package's code and infrastructure.

Aside from the actual code, Astropy is also a community of astronomy-associated users and developers that agree that sharing utilities is healthy for the community and the science it produces. This community is of course central to accomplishing anything with the code itself. We welcome anyone who wishes to contribute to the project and expect everyone in our community to follow the code of conduct when interacting with others.

For more details on background of the project, you can read the original vision from when the project was founded.

For more details, please visit https://www.astropy.org

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  1. astropy astropy Public

    Astronomy and astrophysics core library

    Python 4.9k 2k

  2. astropy.github.com astropy.github.com Public

    The Astropy web pages

    HTML 47 106

  3. astropy-APEs astropy-APEs Public

    A repository storing the Astropy Proposals for Enhancement.

    39 38

  4. astropy-project astropy-project Public

    Documents and policies regarding the Astropy Project as a whole.

    TeX 42 46

Repositories

Showing 10 of 87 repositories
  • astropy-integration-testing Public

    Regular integration tests of Coordinated packages with astropy

    astropy/astropy-integration-testing’s past year of commit activity
    4 5 4 1 Updated Nov 17, 2025
  • astropy Public

    Astronomy and astrophysics core library

    astropy/astropy’s past year of commit activity
    Python 4,931 BSD-3-Clause 1,973 1,305 (15 issues need help) 118 Updated Nov 17, 2025
  • halotools Public

    Python package for studying large scale structure, cosmology, and galaxy evolution using N-body simulations and halo models

    astropy/halotools’s past year of commit activity
    Python 118 BSD-3-Clause 67 61 3 Updated Nov 17, 2025
  • photutils Public

    Astropy package for source detection and photometry. Maintainer: @larrybradley

    astropy/photutils’s past year of commit activity
    Python 285 BSD-3-Clause 146 39 6 Updated Nov 18, 2025
  • extension-helpers Public

    Helpers to assist with building Python packages with compiled C/Cython extensions

    astropy/extension-helpers’s past year of commit activity
    Python 17 BSD-3-Clause 13 6 (2 issues need help) 4 Updated Nov 17, 2025
  • ccdproc Public

    Astropy affiliated package for reducing optical/IR CCD data

    astropy/ccdproc’s past year of commit activity
    Python 93 BSD-3-Clause 89 67 6 Updated Nov 17, 2025
  • astropy-project Public

    Documents and policies regarding the Astropy Project as a whole.

    astropy/astropy-project’s past year of commit activity
    TeX 42 CC-BY-4.0 46 61 29 Updated Nov 17, 2025
  • repo_stats Public

    Git and citation stats for your repo and papers

    astropy/repo_stats’s past year of commit activity
    Python 4 BSD-3-Clause 6 0 0 Updated Nov 17, 2025
  • pytest-arraydiff Public

    pytest plugin to facilitate comparison of results to a pre-defined reference

    astropy/pytest-arraydiff’s past year of commit activity
    Python 28 20 4 1 Updated Nov 15, 2025
  • specreduce Public

    Tools for the reduction of spectroscopic observations from Optical and NIR instruments

    astropy/specreduce’s past year of commit activity
    Jupyter Notebook 67 42 55 10 Updated Nov 14, 2025