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Jump Back in Time 现代时期  (1946 - present)
Swimming pool in Huntingdon, Pennsylvania
一群泳客在宾州杭廷顿市 (摄于19417月)

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夏天到了!许多年以来,621日代表着夏天正式到来了。这一天也就是天文学上的「夏至」 (summer solstice) ,也是一整年里最长的一天 (白天时间最多) 。在这一天里,太阳离地球赤道最为遥远。不过当922日或23日的秋分 (autumnal equinox) 到来时,也意味着夏天退出了。


Summer is here! In many years, June 21 marks the official start of summer. The event is marked by an astronomical event--the summer solstice, the longest day of the year (with the most daylight), which occurs when the sun is farthest from the earth's equator. The season ends with the autumnal equinox (with day and night equal in length) on September 22 or 23.

What does summertime mean to you? A long vacation from school? Swimming and ice cream cones melting in the sun? On June 21 it's summer in the Northern Hemisphere, but in the southern half of the globe, it's the beginning of winter!

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