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地球自轉

地球自zyun2英文Earth's rotation)係指地球自轉。地球每一日會轉到一個圈。

地球曉自己轉,而佢嘅自轉形成咗好多自然現象,好似係日頭夜晚噉。地球相對於太陽嘅自轉週期平均係 86400 (即係廿四個鐘頭),為止一個太陽日(Solar day)。呢個週期唔係定死咗冇得變嘅:家吓地球嘅太陽日已經比起 19 世紀嘅略為長咗啲,每日大約長咗 0 至 2 SI ms [1][2]

由地球上面睇,空中嘅天體都係以每個鐘頭 15°,亦即係每分鐘 15' 嘅角速度,向東邊飛(唔包低軌道嘅人造衛星同大氣層入面嘅流星)。近天球赤道嘅天體每兩分鐘郁嘅距離由地表望落相當於喺地表見到嘅月球或者太陽望落嘅直徑[3][4]

[編輯]
  1. Leap seconds
  2. "Rapid Service/Prediction of Earth Orientation". 原著喺2015年3月14號歸檔. 喺2017年11月12號搵到.
  3. Zeilik, M.; Gregory, S. A. Introductory Astronomy & Astrophysics. 4th. Saunders College Publishing. 1998: 56.
  4. Planetary Fact Sheets
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地球自轉
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