Nearly every four years, we add an extra day to the calendar in the form of February 29, also known as Leap Day. Put simply, these additional 24 hours are built into the calendar to ensure that it stays in line with the Earth’s movement around the Sun. While the modern calendar contains 365 days, the actual time it takes for Earth to orbit its star is slightly longer—roughly 365.2421 days. The difference might seem negligible, but over decades and centuries that missing quarter of a day per year can add up. To ensure consistency with the true astronomical year, it is necessary to periodically add in an extra day to make up the lost time and get the calendar back in synch with the heavens.

1. Many ancient calendars had entire leap months
Many calendars, including the Hebrew, Chinese and Buddhist calendars, are lunisolar, meaning their dates indicate the position of the Moon as well as the position of Earth relative to the sun. Since there is a natural gap of roughly 11 days between a year as measured by lunar cycles and one measured by the Earth's orbit, such calendars periodically require the addition of extra months, known as intercalary or interstitial months, to keep them on track.

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Read More:
5 Things You May Not Know About Leap Day 2020

https://speakersden2..com/2020/02/5-things-you-may-not-know-about-leap.html

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