What calendar did humans use before we got the Gregorian calendar?

We have leap years because the earth does not make a complete revolution in exactly 365 days. It’s more along the lines of 365.24 days. This means that every 4 years, the calendar is roughly 1 day behind where it should be, so we add the day into it (unless it’s a turn of the century and the year isn’t divisible by 400) and we catch ourselves up. The cycle repeats every 400 years. Let’s see how accurate it is:

365.24 * 400 = 146096 days

365 * 400 + 1 * (100 – 3) = 146000 + 97 = 146097 days

So, we gain 1 day every 400 years, roughly. Even the estimate I used is a little overestimated, so we really don’t gain anything close to 1 day.

http://en.wikipedia.org/wiki/Calendar

Leap Year Wikipedia

A Leap Year doesn’t happen every year, a Leap Year happens once every 4 years. The idea of a Leap year is to catch up with the calendar, because a day is not exactly 24 hours, a day is 24 hours and 2 minutes (or something close to that)

See how the earth goes around the sun every 365 days, well it actually a little longer than 365… So leap year (every 4 years) makes up for that lost hours(which then turn into days).

Before Gregorian, everybody had their own, but the most common one was Ceaser’s calendar

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One thing everyone here is seeming to forget is that leap years happen every four years EXCEPT every 100 years but they do have leap year every 400th year. Year 2000 had a leap day, but 2100, 2200, and 2300 will not. 2400 will have a leap day.

Answer 6

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RE:

Why do we have leap years?

What calendar did humans use before we got the Gregorian calendar?

Is there a more accurate calendar that does not need to use leap years?

Answer 7

Because the earth does not make a complete revolution in exactly 365days

true

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