早朝はすでに秋の空です。

　今朝の日の出は５時【群馬県】で、調べてみると、日の出の方角は真北から計って７０°です。ご存じの通り、４２日後の「秋分の日」は地球上のどこから見ても太陽は真東から昇ります。

　ところが、北極点では「秋分の日」の太陽は半分顔を出したままで東～南～西～北の順で水平線を一周します。一方、南極点では「秋分の日」に太陽は半分顔を出したまま、その動きは逆に、「東～北～西～南の順」で地平線を一周します。この動きは日本では考えられない現象で、頭に入れておきましょう。

　それにしても、写真の通り、群馬県の今朝の空は真っ青で、すでに秋の気配です。でも、日中は連日猛暑ですから、喉が渇く前に水分補給です。私は多少涼しくなる夕方６時頃から倉賀野をウォーキングします。目的は足腰の鍛錬と空腹になることです。【内緒ですが、実際はビールが美味しくなることです。】

Dear my Facebook friends abroad

　This morning the sun rose at exactly 5am in my Gumma Prefecture. By checking, I found that the direction of sunrise is just 70° from due north. As you know, on the autumnal equinox day 42 days from now, the sun will rise due east no matter where you look on earth including your nation.

　However, at the North Pole, on the autumnal equinox day the sun remains half-exposed as it circles the horizon in the order east-south-west-north. On the other hand, at the South Pole, on the autumnal equinox day the sun remains half-exposed as it circles the horizon in the order east-north-west-south. This sun's movement is unthinkable in Japan, so keep it in mind.

　As you can see in the photo, the sky in Gumma Prefecture this morning is bright blue, and there are already signs of autumn. However, it has been extremely scorching hot every day during the daytime, so it's indispensable to hydrate before you feel thirsty. I start walking around Kuragano from 6pm when it cools down a bit. The purpose is to strengthen my legs and get hungry. (This is Just between you and me and lamppost, my real purpose is to make beer taste better.)

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