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29 Leap Year. Numberphile. Brady Haran 原始内容存档于2017-05-22）. 《大英百科全书》中的条目：Leap year (Calendar) （英文） Famous Leapers; Leap Day Campaign: Galileo Day; History Behind Leap Year （页面存档备份，存于互联网档案馆） National Geographic Society
The following graph illustrates the annual shift of the summer solstice between 1750 and 2250 due to the leap year adjustment every four years and the leap year rules for years divisible by 100 and 400 years. The X axis (at the bottom, horizontal) shows the year numbers, the Y axis (left side, vertical) shows the date of the summer solstice in June (20th to 23rd).
25 de feb. de 2024 · Advertising perpetuated the leap year marriage game. A 1916 ad by the American Industrial Bank and Trust Co. read thusly: “This being Leap Year day, we suggest to every girl that she propose to her father to open a savings account in her name in our own bank.” There was no breath of independence for women due to leap day.
6 de may. de 2024 · Leap years happen because a planet’s orbit around the Sun (year) and rotation on its axis (day) are not perfectly in line. This is true of almost every other planet in our solar system. Mars, for example, has more leap years than regular years! A year on Mars is 668 sols, or Martian days. However, it takes 668.6 sols for Mars to go around the ...
閏年 （うるうどし、じゅんねん、 英語: leap year 、 intercalary year ）とは、 閏 のある 年 である。. これに対し、閏年ではない年を 平年 （へいねん、 英語: common year ）と呼ぶ。. 閏年は、 太陰太陽暦 では、月の運行を基準にしていることで生じる季節（太陽 ...
This year, there won’t be 365 days as normal, there will be 366. With the extra day tacked on to the end of our shortest month: February. That’s right, 2020 is a leap year.
26 de feb. de 2024 · Why do we have leap years, and what are we supposed to do — or not do — with our rare extra day? NPR's Morning Edition spoke with experts in astronomy, history and economics to find out.
