 summer time dog days of summer 2022 Many people believe the phrase "dog days of summer" stems from the fact that dogs tend to be a bit on the lazy side during the hottest days of summer. Of course, who can blame them? With that much fur, dogs that exercise during the hot days of summer can overheat easily. 许多人认为“夏季三伏天”这个词源于在夏季最热的日子里，狗往往有点懒惰。当然，谁能责怪他们？有了这么多的皮毛，在炎热的夏天锻炼的狗很容易过热。 However, the phrase doesn't stem from lazy dogs lying around on hot and humid days. Instead, to find the answer, we only need to look to the summer sky. 然而，这个短语并不源于湿热天气四处躺着的懒洋洋的狗。相反，为了找到答案，我们只需要看看夏天的天空。 The ancient Romans called the hottest, most humid days of summer "diēs caniculārēs" or "dog days." The name came about because they associated the hottest days of summer with the star Sirius. Sirius was known as the "Dog Star" because it was the brightest star in the constellation Canis Major (Large Dog). Sirius also happens to be the brightest star in the night sky.
Sirius is so bright that the ancient Romans thought it radiated extra heat toward Earth. During the summer, when Sirius rises and sets with the Sun, they thought Sirius added heat to the Sun's heat to cause hotter summer temperatures. 天狼星如此明亮，以至于古罗马人认为它向地球辐射了额外的热量。在夏天，当天狼星随着太阳升起和落下时，他们认为天狼星增加了太阳的热量，导致夏季温度升高。 For the ancient Romans, the dog days of summer occurred from about July 24 to around August 24. Over time, though, the constellations have drifted somewhat. Today, The Old Farmer's Almanac lists the traditional timing of the dog days of summer as being July 3 until August 11. 对于古罗马人来说，夏季的三伏天大约发生在7月24日到8月24日之间。不过，随着时间的推移，星座有点漂移。今天《老农年鉴》将夏季三伏天的传统时间定为7月3日至8月11日 Although the dog days of summer are usually the hottest, they don't have anything to do with either dogs or the star Sirius. Instead, the tilt of the Earth explains why these days tend to be the summer's hottest. 虽然夏季的三伏天通常是最热的，但它们与狗或天狼星都没有任何关系。相反，地球的倾斜解释了为什么这些天往往是夏天最热的。 During summer in the Northern Hemisphere, the tilt of the Earth causes Sun's light to hit the Northern Hemisphere at a more direct angle, and for a longer period of time throughout the day. This means longer, hotter days during the summer. 在北半球的夏季，地球的倾斜导致太阳光以更直接的角度照射北半球，并在一天中持续更长的时间。这意味着夏季的白天更长、更热。 This explains why the dog days of summer are from late January to early March in the Southern Hemisphere. The actual dates of the dog days of summer will vary by location, depending upon latitude and climate. 这就解释了为什么南半球夏季的三伏天是从一月底到三月初。夏季三伏天的实际日期因地理位置而异，取决于纬度和气候。
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