Topic Reading-Vol.2890-3/10/2020
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Topic Reading-Vol.2890-3/10/2020
0422-27-5366
〒180-0006 東京都武蔵野市中町2-3-5 IIHA武蔵野1階
電話受付/月〜金 9:00-18:00
Topic Reading-Vol.2890-3/10/2020
Dear MEL Topic Readers,
Why do we need leap years?
We had the 29th day in February this year. You might remember that we have an extra day when we have the Olympic Games. Yes, 2020 is a leap year. But do you know why we need to add an extra day every four years?
An extra day is added to the calendar at the end of February every four years, or in a leap year, making the year 366 days. The extra day adjusts the variance between the 365-day calendar and the actual time, 365.24 days, for Earth to rotate the sun. The leap years were set when the Gregorian calendar was created by Pope Gregory XIII in 1582.
But is that it? You might have realized that the additional time to orbit the sun is 0.24 days to 365 days, NOT 0.25 days. What does the calendar do with the variance?
Enjoy reading the article and learn about the mechanism and origin of leap years.
https://earthsky.org/human-world/why-do-we-need-leap-years
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