Questions tagged [calendar]

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2answers
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Were people in the ancient or medieval times aware of how exactly a solar year is equal to a lunar year?

Was it common knowledge around 600 AD or perhaps 30 BCE that 200 solar years for example were equal to 209 lunar years? In which period of history precisely can we say that such a thing was confirmed?
1
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2answers
180 views

Why was 0 0 0 chosen to be the start of the calendar?

What's the significance of date 0 0 0 ? Why was this day chosen to be the start of the calendar ? What comes before 0 0 0 ? I know they say BC. But then shouldn't current time be called AD ? Don't ...
3
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1answer
251 views

Length of the year in Aztec/Maya calendar

In an old book of Prescott (died in 1859), The conquest of Mexico, the author described Aztec calendar with a year of 365 days. To compensate for the difference, every 52 years an additional 12.5 days ...
10
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3answers
1k views

Why should February have 28 days?

According to the Gregorian calendar the second month i.e. February have 28 days and in a leap year 29 days. I am not sure what calculations(science) it takes to decide the total number of days in ...
23
votes
6answers
3k views

Is there an astronomical reason behind the order for the names of days of the week?

The seven days of the week seems to be commonly named after celestial bodies. What I find curious is that all seven days apparently share the same names in both West and East. Sunday is, of course, ...