The average year is, in fact, 365.242 days long – just so long as you’re not talking about the sidereal year. So what’s that? Simply put, a sidereal year – it’s pronounced sy-dear-ee-al ...

The Romans added January and February to the calendar but ran into a problem — math and superstition. Here's why February became the odd month out.

Slightly less than the 24 hours of a solar day (23 hours, 56 minutes, 4.1 seconds). Used in astronomy, sidereal means "when a star crosses the meridian" (the meridian is an imaginary circle around ...

It is a solar calendar that uses 12-13 lunar months per solar sidereal year. The Vikram Samvat calendar is usually 57 years ahead of the Gregorian calendar, except for January-April when it is 56 ...

Sidereal Confluence: Trading and Negotiation in the Elysian Quadrant was one of the most intriguing releases of 2017, a heady mix of trading and diplomacy between alien factions in deep space that was ...