DIY circadian rhythm based lighting

The Sun Events app takes “Sunlight Change” into account. With this value it’s possible to adjust the light temperature and brightness depending on the current position of the sun as explained in this post.
So it’s not exact the same behavior of the light as done with the script, because “Sun Events method” takes into account the seasons.

Circadian Rhythm Light as @iotnerd wanted could probably have been realized with the app Splines, but the app is no longer available.

Otherwise, I don’t know of any other app.