Speaking of things that are hard to notice, the Earth’s rotation is hard to notice. It seems like we’ve never been able to sense it. Apparently the Earth rotates on its axis at 1,670 km per hour, but I find it strange that we can’t sense how fast it rotates. If it stopped rotating, there would be places where the sun shines and places where it doesn’t, and there would be scorching hot and freezing cold, and if the mantle stopped flowing, there would be no geomagnetic field either. It’s amazing that it rotates.
https://www.lettuceclub.net/news/article/1122508
It is thought that one rotation of the Earth takes about one day, and most living things on Earth have a rhythm in their bodies that reflects the length of a day. There is a circadian rhythm based on about 24 hours, which affects cyclical biological reactions such as sleepiness and hormone fluctuations. Is it something like a body clock?
https://www.brainscience-union.jp/trivia/trivia1227
This rhythm is apparently memorized at the atomic level by proteins, and the activity of the molecules that generate energy oscillates on a 24-hour cycle. It feels like it’s synchronized with the rotation of the Earth. Since morning and night have been a part of our lives since we were born, we don’t really notice it, but it makes me think how amazing biological functions are.
https://resou.osaka-u.ac.jp/ja/research/2015/20150626_1
The proteins that support biological clocks are collectively called clock proteins. In addition to circadian rhythms, there are also circamonthly rhythms, circannual rhythms, and rhythms of less than one minute such as breathing and heart rate. These are thought to capture periodic motions other than the Earth’s rotation, but how on earth do they acquire these rhythms?
In addition, the Earth’s rotation also affects the circulation of the Earth’s atmosphere, and what should have been one circulation is now split into three small circulations. This is how the westerly winds are created. Perhaps the small circulations have helped stabilize the climates of low, mid, and high latitudes.
https://www.rd.ntt/se/media/article/0044.html
It seems that not only the rotation but also the angle of the Earth’s axis of rotation is important. The axis of rotation is tilted, but that tilt seems to be necessary for the evolution of complex life. In Japan, it is interesting that we have seasons due to the tilt of the Earth’s axis, but it is also related to the evolution of life. I’m sure the Earth has an exquisite tilt. Rotation is amazing. The Earth is amazing.
https://astropics.bookbright.co.jp/a-planets-tilt-toward-complex-life
