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

cepheus-navis
5.12.4

This version was deleted from PyPI around 2026-04-17. Installing fails with:
$ pip3 install cepheus-navis==5.12.4 ERROR: Could not find a version that satisfies the requirement cepheus-navis==5.12.4
View other deleted versions of cepheus-navis

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/2026-04-16/ \ cepheus-navis==5.12.4
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
cepheus_navis-5.12.4-cp39-abi3-macosx_10_9_universal2.whl (20.1MB)
cepheus_navis-5.12.4-cp39-abi3-manylinux1_x86_64.manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_5_x86_64.whl (35.2MB)
cepheus_navis-5.12.4-cp39-abi3-win_amd64.whl (9.7MB)