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Who invented the first calendar? Why do we have a leap year?
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The first calender was invented by the Greeks. We have a leap year because,
one day insint 24 hours, one day = 23 hours, 56 minutes and 4 seconds. After 4 years, the remaining of 23 hours, 56 minutes and 4 seconds become complete and thus form a exxtra day which comes as February 29. It is called a leap year.
Earth is slowing down and one day we will not have a leap year.
are you sad?
Posted by astrosonuthird on August 5, 2012 at 7:44 AM (Answer #4)
The question of who invented the first calendar is very hard to answer -- no one knows for sure. Many ancient societies had them. The Egyptians are, however, credited with the first solar calendar (based on the sun as opposed to on the cycles of the moon).
The reason we have a leap year is much easier... As you know, a year is defined as the time it takes the earth to complete one orbit of the sun. Sadly, the earth doesn't take a whole number of days to orbit but instead takes 365.25 days to orbit the sun.
So, every four years we add an extra day to make up for the fact that our year is actually one-quarter day shorter than it should be.
Posted by pohnpei397 on October 21, 2009 at 11:12 AM (Answer #1)
Calendar is a system of measuring and recording times in terms of days and years. Many different types of calendar were developed and used by people in different parts of the world. Exact knowledge about many of these calendars is lost. The oldest calender about which information exists is perhaps the Hebrew calendar.
The Hebrew calendar started 3760 years and 3 months before christian era. This calendar is based on lunar movement. One year in this calendar consists of 12 months which are alternatively 29 and 30 days long. Seven times during every 19 year period and extra month of 29 days is added to keep the calendar year and the real solar year in line.
Egyptians started using a calender much before the Start of Hebrew calendar. Their calendar was based on the solar system. According to experts the earliest known date according to Egyptian calendar is 4236 B.C.
Posted by krishna-agrawala on October 21, 2009 at 2:54 PM (Answer #2)
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