白露丨秋高氣爽

“蒹葭蒼蒼，白露為霜?！薄吨袊煳哪隁v》顯示，9月7日23時32分迎來2022年“白露”節(jié)氣。

天象預報

白露——秋分

太陽

從獅子座運行至室女座。目前太陽活動性不強，太陽正面有數(shù)群小黑子，可通過帶減光的望遠鏡觀測。

月亮

9月10日（農(nóng)歷八月十五，中秋節(jié)）17時59分望，太陽落山不久，珠圓玉潤的月亮便從東方升起，在夜空中陪伴我們共度良宵。

水星

昏星，9月10日留，在室女座由順行轉(zhuǎn)為逆行。日落后出現(xiàn)在西偏南方向的低空，觀測條件逐漸變差。

金星

在獅子座順行。與太陽的角距離持續(xù)減小，黎明前出現(xiàn)在東方的低空，肉眼可以觀測。

火星

在金牛座順行。亮度逐漸增加，夜晚23時左右升起，黎明前都可以觀測。

木星

在雙魚座逆行。9月11日木星合月，夜晚可見木星與月亮相伴從東方升起。

土星

在摩羯座逆行。入夜即從東南方升起，整夜都可以觀測。

小知識

生活在海邊的人們對海水在一天中兩次漲落的潮汐現(xiàn)象一定不會陌生。潮汐主要由月球、太陽等天體的引力產(chǎn)生的引潮力造成。引潮力等于被吸引天體某部分受到的引力與該天體中心處同樣質(zhì)量部分受到的引力之差（向量差），其數(shù)值與引力來源天體的質(zhì)量成正比，與兩天體之間的距離的立方成反比。月球?qū)Φ厍虻囊绷ψ畲螅浯问翘?，是月球?6%，其他七大行星加起來的引潮力最大使海水漲落也不超過0.4毫米。

在農(nóng)歷的一個月中，當朔和望時，太陽和月球的引潮力疊加在一個方向上，潮水漲落最大，稱為大潮；上、下弦時，太陽、月球引潮力方向相互垂直，有抵消作用，潮水漲落最小，稱為小潮。通常海水一天漲落兩次，發(fā)生在月球上、下中天的時刻。不過實際上，在某一具體地點，由于太陽、月球的高度和方位錯落變化，海底及海岸地形不同及海水流動時的摩擦作用，潮汐漲落的大小和時間規(guī)律是相當復雜的，不同地點，表現(xiàn)各不相同。

The White Dew

The fifteenth solar term of the traditional Chinese calendar, White Dew (BaiLu in Chinese), falls on September 7th at 23:32 (Beijing Time) in 2022, when the Sun reaches a longitude of 165o. After White Dew, as daytime in the north hemisphere becomes shorter, the weather gradually turns cool and the temperature difference between day and night increases. As a result, water vapour near the ground condense into dews in the morning. The ancient Chinese associated the four seasons with the five elements. Autumn was matched with metal, which is white, therefore this solar term is called the "White Dew".

Astronomical Forecast

White Dew——Autumn Equinox

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The Sun

The sun travels from Leo to Virgo. Currently, solar activity is low, with a few groups of small sunspots on its surface. They can be observed through a telescope with a safe solar filter.

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The Moon

On Sept. 10th at 17:59, the moon becomes full moon. In Chinese lunar calendar, this day is Aug. 15th, the Mid-Autumn Festival. The moon will rise in the eastern sky shortly after sunset.

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Mercury

Mercury appears as an "evening star". It is stationary on Sept. 10th. It travels in Virgo from prograde motion to retrograde motion. After sunset, it appears in the low south-western sky and becomes harder to observe.

♀

Venus

Venus travels in prograde motion in Leo. Its angular distance to the sun continues to decrease. It appears in the low north-eastern sky before sunrise and can be spotted with the naked eye.

♂

Mars

Mars travels in Taurus in prograde motion. Its magnitude increases gradually. It rises around 23:00 and can be seen till dawn.

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Jupiter

Jupiter travels in Pisces in retrograde motion. It is in conjunction with the moon on Sept. 11th. We can see Jupiter and the moon rise together in the eastern sky.

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Saturn

Saturn travels in retrograde motion in Capricornus. It rises from the south-eastern sky in the evening and can be observed all night.

輪值主編：袁強

制作、編輯：王科超

英文版設計：朱曼清

（金陵中學）ZHU manqing