9月6日（日）快晴
ケアンズ周辺でも高温少雨の影響で山火事が頻発しています。一昨日久し振りの雨。雨上がりに西のテラスから低い虹が見えました。虹の高さは太陽の位置で決まります。水滴の光の屈折率から、虹は太陽を背にした地上の観測者から42度の上空に見えます。だから太陽の位置が低いと高い虹、太陽の位置が高いと低い虹が見えます。虹の謎を解明したのは16世紀の哲学者にして数学者のデカルト。「方法序説」に虹発生のメカニズムを発表しています。数学は哲学の母、詩の祖母。真善美は三位一体です。
高い虹
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Low rainbow
Sun. September 6 : fine
Bush fire has occurred frequently around Cairns because of high temperature and little rainfall. It rained after a long separation the day before yesterday. After the rainfall I saw a low rainbow from the west terrace of our unit. The height of the rainbow depends on the position of the sun. According to the reflective index of water-drop a rainbow is seen 42 degree up of the sky by the spectator who stands with one’s back to the sun. So you see the high rainbow when the sun is low and vice versa. The mystery of the rainbow was dissolved by Descartes, a philosopher and also a mathematician from the 16 century. He published the mechanism of appearance of rainbow in his book, “the Discourse on Method”. Mathematics is mother of philosophy and grandmother of poetry. Truth, good and beauty are the Trinity.
high rainbow
ケアンズ周辺でも高温少雨の影響で山火事が頻発しています。一昨日久し振りの雨。雨上がりに西のテラスから低い虹が見えました。虹の高さは太陽の位置で決まります。水滴の光の屈折率から、虹は太陽を背にした地上の観測者から42度の上空に見えます。だから太陽の位置が低いと高い虹、太陽の位置が高いと低い虹が見えます。虹の謎を解明したのは16世紀の哲学者にして数学者のデカルト。「方法序説」に虹発生のメカニズムを発表しています。数学は哲学の母、詩の祖母。真善美は三位一体です。
高い虹
.......................................................................................................................................
Low rainbow
Sun. September 6 : fine
Bush fire has occurred frequently around Cairns because of high temperature and little rainfall. It rained after a long separation the day before yesterday. After the rainfall I saw a low rainbow from the west terrace of our unit. The height of the rainbow depends on the position of the sun. According to the reflective index of water-drop a rainbow is seen 42 degree up of the sky by the spectator who stands with one’s back to the sun. So you see the high rainbow when the sun is low and vice versa. The mystery of the rainbow was dissolved by Descartes, a philosopher and also a mathematician from the 16 century. He published the mechanism of appearance of rainbow in his book, “the Discourse on Method”. Mathematics is mother of philosophy and grandmother of poetry. Truth, good and beauty are the Trinity.
high rainbow
