ppt模板藍天飛機主題(編輯修改稿)
2025-08-18 09:04 本頁面
【文章內(nèi)容簡介】 是因為地球在環(huán)繞太陽時，不斷改變公轉(zhuǎn)軌道的角度，使得太陽赤道自轉(zhuǎn)的視運動大約是 28天 [27]。這種緩慢旋轉(zhuǎn)作用的離心力在赤道的效應(yīng)不及太陽引力的 1,800萬分之一，即使是行星產(chǎn)生的潮汐力也因為太微弱而對太陽的形狀起不了作用 [28]，但大質(zhì)量的木星仍使核心偏離中心達一個太陽半徑。 樣例文本 3 ? A partial eclipse occurs when the Sun and Moon are not exactly in line and the Moon only partially obscures the Sun. This phenomenon can usually be seen from a large part of the Earth outside of the track of an annular or total eclipse. However, some eclipses can only be seen as a partial eclipse, because the umbra passes above the Earth39。s polar regions and never intersects the Earth39。s surface. ? The Sun39。s distance from the Earth is about 400 times the Moon39。s distance, and the Sun39。s diameter is about 400 times the Moon39。s diameter. Because these ratios are approximately the same, the Sun and the Moon as seen from Earth appear to be approximately the same size: about degree of arc in angular measure. 樣例文本 3 ? A partial eclipse occurs when the Sun and Moon are not exactly in line and the Moon only partially obscures the Sun. This phenomenon can usually be seen from a large part of the Earth outside of the track of an annular or total eclipse. However, some eclipses can only be seen as a partial eclipse, because the umbra passes above the Earth39。s polar regions and never intersects the Earth39。s surface. ? The Sun39。s distance from the Earth is about 400 times the Moon39。s distance, and the Sun39。s diameter is about 400
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