You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

flyfield
2025.9.15

This version was deleted from PyPI around 2025-09-18. Installing fails with:
$ pip3 install flyfield==2025.9.15 ERROR: Could not find a version that satisfies the requirement flyfield==2025.9.15
View other deleted versions of flyfield

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2025-09-17/ \ flyfield==2025.9.15
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Or, download files manually

And install manually via pip:
flyfield-2025.9.15-py3-none-any.whl (26.0KB)
flyfield-2025.9.15.tar.gz (22.1KB)