
A simple, accurate, solar calender for Earth
Comparison of Earth Calendars
Name | Type | Perpetual | months/year | days/month | days/week | Status | Pros * | Cons * |
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Earthian | solar | no | 12 | 30-31 | 7 | proposed |
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Gregorian | solar | no | 12 | 28-31 | 7 | current |
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Traditional Chinese | lunisolar | no | 12-13 | 29-30 | 7 | current |
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Hebrew | lunisolar | no | 12-13 | 29-30 | 7 | current |
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Islamic | lunar | no | 12 | 29-30 | 7 | current |
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Iranian | solar | no | 12 | 29-31 | 7 | current |
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Indian National | solar | no | 12 | 30-31 | 7 | current |
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Buddhist | lunisolar | no | 12-13 | 29-30 | 7 | current |
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Julian | solar | no | 12 | 28-31 | 7 | deprecated |
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Egyptian, French Republican | solar | yes | 12 + 5-6 days | 30 | 10 | deprecated |
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World | solar | yes | 12 + 1-2 days | 30-31 | 7 | proposed |
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Positivist | solar | yes | 13 + 1-2 days | 28 | 7 | proposed |
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New Earth | solar | yes | 13 | 28 | 7 | proposed |
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* There are a few advantages and disadvantages common to certain types of calendars, so in the interest of avoiding repeating myself I have listed them below instead of in the "Pros" and "Cons" columns:
Pros:
- All solar calendars are synchronised with the seasonal cycle.
- All lunar and lunisolar calendars are synchronised with the lunar cycle.
- In perpetual calendars dates always map to the same day of the week, regardless of the year, which can be very convenient. Because the same calendar can be used every year, this saves paper and is therefore good for the environment.
Cons:
- Months in solar calendars are not aligned with the lunar cycle.
- In lunar and lunisolar calendars, calendar years are not aligned with seasonal markers. The year length also varies in length by up to 30 days (354 - 384 days), thus causing a large leap baby problem.
- Non-perpetual calendars require many different page layouts for calendar months. The Gregorian Calendar is probably the worst, with 28 possible page layouts. This is less tidy or convenient, plus it wastes paper. (It is good for the printing business, however.)