Home Calendars Sidereal Time Universal Time Time Zones

 

Calendars
Sidereal Time
Universal Time
Time Zones

Astronomy and the study of time have been intertwined for thousands of years.  Here's some information about how it is used in a standardized way by astronomers all around the world, plus info about how the calendar evolved, and how we define the celestial coordinate system.

 

Today's Julian Date

 

 

11/2011