Four Popular Calendars
Solar |
Lunar |
Julian |
|
Gregorian (modern) |
|
Hebrew |
|
Muslim |
|
Month Names |
days |
Month Names |
days |
Month Names |
days |
Month Names |
days |
January |
31 |
January |
31 |
Tishri |
30 |
Muharram |
30 |
February |
28+1 |
February |
28+1 |
Heshvan |
29-30 |
Safar |
29 |
March |
31 |
March |
31 |
Kislev |
29 |
Rabi I |
30 |
April |
30 |
April |
30 |
Tevet |
29-30 |
Rabi II |
29 |
May |
31 |
May |
31 |
Shevat |
30 |
Jumada I |
30 |
June |
30 |
June |
30 |
Adar |
29-30 |
Jumada II |
29 |
July |
31 |
July |
31 |
Nisan |
30 |
Rajab |
30 |
August |
31 |
August |
31 |
Iyar |
29 |
Sha'ban |
29 |
September |
30 |
September |
30 |
Sivan |
30 |
Ramadan |
30 |
October |
31 |
October |
31 |
Tammuz |
29 |
Shawwal |
29 |
November |
30 |
November |
30 |
Av |
30 |
Dhu al-Qa'dah |
30 |
December |
31 |
December |
31 |
Elul |
29 |
Dhu al Hijjah |
29-30 |
Total Days |
365.25 |
365.242193 |
|
|
354-355 |
|
354-355 |
Notes:
- General
- x + 1 (means month length increases during
specified calendar's leap year)
- x - y (means that month length is periodically
changed for lunar alignment)
- Julian (named after Julius Caesar)
- solar calendar
- 365.25 days long (yes, the Romans had leap years
every four years)
- Gregorian
(named after Pope Gregory)
- solar calendar
- 365.242193 days long, not 365.25 days as most people
think.
- Hebrew
- lunar calendar
- year 5743 coincided with September 18, 1982
through August 10, 1983.
- Muslim
- lunar calendar
- year 1396, Muharram coincided corresponded with
January 1976.

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Neil Rieck
Waterloo, Ontario, Canada.