# Tag Info

### Why was 0000 chosen to be the start of the calendar?

In the common counting (in history) there is no year zero. Our common calendar begins with year 1 AD preceded by year 1 BC. See https://en.wikipedia.org/wiki/Calendar_era, chapter Dionysian Common Era....
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Accepted

### Is there another calendar with the equivalent of gregorians weeks?

The French Republican Calendar, actually used for a time in France... LINK The weeks were 10 days each, called "décades".
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### Why was 0000 chosen to be the start of the calendar?

I suspect that your notation 000 misses one extra zero and what you have in mind is the ISO 8601 calendar. This calendar does have the year 0000 (which corresponds to 1BC), dates prior to that have ...
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Accepted

### Length of the year in Aztec/Maya calendar

The standard literature on the Mayan calendar is: J. Eric S. Thompson, Maya Hieroglyphic Writing, Washington : Carnegie Institution, 1950. Lis Brack-Bernsen, 'Die Basler Mayatafeln', Verhandlungen ...
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### Did the 1800 Gregorian Lunar Correction Motivate Gauss' Computus Algorithm?

The motivation for producing the algorithm was for a convenient way of calculating Easter by arithmetical methods, without requiring reference to extensive tables which was the established method at ...
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1 vote

### Spirals as calendrical representations

New is well forgotten old, it seems. In a couple of papers from 1916 Marcel Baudouin discusses as matter of fact the linking of spiral and the Sun's path: The spiral represents the Sun's path in ...
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1 vote

### Were people in the ancient or medieval times aware of how exactly a solar year is equal to a lunar year?

Hipparchus, who lived in the 2nd century BCE, calculated the length of the synodic lunar month as 29.53059 days, and that of the tropical year as 365.24667 days (though he expressed both values not in ...
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1 vote

### Length of the year in Aztec/Maya calendar

FWIW: ~ Gama, 1790, P.25 indicates "...pero la corrección no se hacia hasta el fin del Ciclo, en que se intercalaban juntos los 13 días, que gastaban en fiestas, en honor de los dioses seculares, ...
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