楽しみな 今週末の 中秋の名月

　毎日曇り空が続いてますが、写真の月は先月に満月を撮ったものです。今月１０日の晩は満月で「中秋の名月」です。つまり、旧暦で８月１５日です。この日は未来永劫、必ず仏滅です。

　ところで、満月のとき月食が起こる場合があります。今年は世界で２回起こると言われてますが、日本で見える月食は1回のみで、11月8日の午後6時09分から皆既月食が起こると計算されてます。

　因みに、月までの平均距離は38万kmですから、仮に、地球を月まで転がすと９回転半です。なお、月から地球を見ると、地球は動かず、常に空の一点に浮いてます。そして、大陸が西から東へ１日１回動いてるのが見えるでしょう。日本列島もよく見えると考えます。それは地球の直径は月の直径の３．６６倍だからです。

　また、月から見ると地球も満ち欠けがあり、１ヶ月に一度、半月のようになったり、三日月のようになりますが、光る部分は月の満ち欠けと左右が逆に見えます。

Dear my friends who like an autumnal moon

　It's been cloudy every day, but the moon in the picture was taken last month. The full moon on the evening of the 10th (Saturday) of this month is the "Mid-Autumn Moon" or we say "Harvest Moon". In other words, it is August 15th in the lunar calendar. This day will forever be Butsumetsu that means unlucky day in Japan.

　"By the way, a lunar eclipse may occur sometimes in case of the full moon." It is said that there will be two lunar eclipses in the world in 2022, but only one lunar eclipse will be visible in Japan. It will be a total lunar eclipse starting at 6:09 on November 8th.

　Not change the subject, but the average distance to the moon from the earth is 380,000 km, so if we roll the earth to the moon, it would take nine and a half revolutions. And if we look at the earth from the moon surface, the earth does not move and is always floating in the same place in the sky. And we will see the earth, the continents move from west to east once a day. I think that the Japanese archipelago can be seen well. This is because the diameter of the Earth is 3.66 times of the diameter of the Moon.

　Also, when viewed from the moon, the earth also has phases, and once a month it becomes like a half moon or like a crescent moon, but the shining part looks reversed compared to the phases of the moon.