Astronomical (UTC)
| Epoch | Confidence |
|---|---|
| 30 December 0 BCE +00:00:00 | Exact |
Overview
The Astronomical calendar is a standard for calculating dates of astronomical or historical events. It is a combination of the Gregorian calendar for dates after midnight on 15 October 1582 and the Julian calendar for dates before.
Unlike the Julian calendar, it utilizes Year 0 to enable the easier calculation of years, which causes it to appear 1 year ahead of the Julian calendar before 1 AD.
Years are not denoted with anything and are simply listed as a positive or negative number.
Info
| Month | Days |
|---|---|
| January | 31 |
| February | 28 or 29 |
| March | 31 |
| April | 30 |
| May | 31 |
| June | 30 |
| July | 31 |
| August | 31 |
| September | 30 |
| October | 31 |
| November | 30 |
| December | 31 |
| Weekday |
|---|
| Sunday |
| Monday |
| Tuesday |
| Wednesday |
| Thursday |
| Friday |
| Saturday |
Accuracy
This calendar is a simple calculation and is considered to be exactly accurate.
| Dependencies |
|---|
| Gregorian |
| Julian |
Source
Common Source
Primary Sources
Jean Meeus outlines the usage of the Astronomical calendar starting on page 59 of Astronomical Algorithms.