立秋について

　今日は二十四節気の一つ「立秋」です。カレンダーに「立秋」と書いてあるからではなく、公転軌道上を北極星側から見て反時計回りに公転してる地球が、太陽系の周囲にほぼ等間隔に並んでいる「黄道十二星座」の一つである「やぎ座」の方角にやって来た日です。

　これは地球人ある私たちが深夜０時に真南を見れば、図の通り、やぎの顔に似た星座が輝いています。このことはどの国で見ても同様です。ところで、人類の先達が作ったカレンダーは本当によく出来ており、後世に生きてる私たち約８０億人は日々その恩恵に浴して生活しています。カレンダーは天体の動きを基にできています。

　前述の通り、二十四節気とは公転してる地球が「どの黄道十二星座の方角に来ているか」と言うことです。その基準は春分の日であり、この時、地球から見る太陽は「魚座」のすぐ下の天の赤道上にある春分点にあります。

　いよいよ今日から秋です。山岳地帯ではすでに秋の気配になっており、平野が依然として暑いのは暖まってしまった「地面は冷め難い性質がある」からです。それでも、今日の日の出は夏至の日より、すでに３０分も遅くなっており、日の入りも同様に早まり、昼の時間は夏至より約１時間短くなってます。この原因は地球の軸が２３．５°ほど傾いたまま公転を続けているからです。暑い暑いと言っても、朝晩は次第に涼しくなるでしょう。

Dear my friends abroad

　The simultaneous interpretation for your understanding will be after my radio gymnastics held in the nearby park and breakfast in Japan time.

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　Today is "Risshu" that means the beginning of autumn. This is one of the 24 solar terms in Japan. This is not because it is written as "the beginning of autumn" on the calendar, but because it is the day when the Earth which is revolving counterclockwise as seen from the North Star, reaches the direction of Capricorn which is one of the 12 zodiacal constellations that are arranged at almost equal intervals around the solar system.

　When we, as Earthlings, look due south at midnight tonight, we will see a constellation that resembles the face of a goat shining, as shown in the image. This is the same in any country. By the way, the calendar made by our predecessors is really well made, and about 8 billion of us who live in later generations enjoy their benefits every day. The calendar is based on the movement of celestial bodies.

　As I mentioned above, the 24 solar terms refer to the direction of the 12 zodiacal constellations in which the Earth is revolving. The standard for this is the vernal equinox, when the sun as seen from the Earth is at the vernal equinox point which is on the celestial equator just below the constellation of Pisces.

　Fall finally begins today. It's already beginning to feel like autumn in the mountainous regions. The plains are still hot because the ground has a tendency to not cool down easily once it's warmed up. Even so, today's sunrise is already 30 minutes later than the summer solstice, and sunset is similarly earlier. It means that the daylight hours are about an hour shorter than the summer solstice. This is because the Earth continues to revolve around its axis while keeping tilted at about 23.5 degrees. Even though you feel still hot, it will gradually get cooler in the morning and evening day by day.

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