Coordinates & Time · 1 entries
Time Representation
How astronomers timestamp observations — the Julian date, a single continuous count of days used throughout astronomy.
- Julian DateTime scaleJD
A continuous count of days (and fractions) since noon Universal Time on 1 January 4713 BC in the proleptic Julian calendar, used throughout astronomy to timestamp observations without the awkwardness of calendar months and leap years. The Modified Julian Date (MJD = JD − 2400000.5) shifts the origin to a recent midnight for convenience.