THIS is what YouTube was created for!

[user328]

The JavaScript moon phase was always hosted on our own sites. It was a tiny script, a small photo of the full moon, and a single pixel black image that was used to fill in the shadow.

The modern version uses moon phase emojis. It's a lot more efficient since it prints a single Unicode character rather than calculating the position of all those black pixels for the shadow. But it's not as pretty as the old school version that has a real photo of the moon.

https://jasonsturges.medium.com/moons-lu...219acbfe6e