About time keeping, the definition of “sidereal” is “of or with respect to the distant stars (i.e. the constellations or the fixed stars, not the sun or planets)”, as defined after a google search.

WATCH COMPLICATIONS EXIST to demonstrate a manufacturer’s prowess. These functions, defined as any display beyond hours, minutes and seconds, can be useful, like multiple time zones or the date, or ...

Pop quiz! How long is the average year? If you said “365 days”, then congratulations! You’re wrong. If you said “365.25 days” ...

A few days ago I posted a video by José Francisco Salgado showing the sky over telescopes in Chile. He’s just put up another one, this time showing the motion of the sky over several observatories: ...