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The Earth's orbit

Very concise and fascinating summary of all (?) of Earth's movements.

This is why astrology cannot work: the position of the stars on the sky keeps changing, and is certainly different since the time astrology got started. Astrological predictions have not changed to accommodate the current position of the constellations...

More interestingly, some of the variation in the Earth's orbit explains the ice ages.

It is humbling that all of human civilisation relies on appropriate intervals in Earth's ever-changing orbit around the sun. And makes me feel very lucky, not only to be alive at a time where it is possible, but also at a time where we can understand why it is possible.

Understanding why starts with this 10 min clip.

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