Calendar: The law of gravity is found based on whose research data?

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This illustration comes from "Astronomical Engineering" published in 1589. The picture shows a six -point meter used to measure the angle between the two distant targets.

The six -point instrument is usually used to measure the angle between the celestial body and the horizon. It can be known to the latitude of the location through simple calculations. It is especially suitable for positioning at sea without reference objects.Because it is very light and reliable, even after the radio positioning method appeared in the 1940s, the ship still needs to prepare six points in case the backup positioning tool after the electronic equipment.

In addition to many astronomical instruments, the book "Astronomical Engineering" also focuses on the important achievements of astronomer Tanu Brah.For example, many instruments invented by Tigu provide more accurate observation data and help Capeler proposes the law of planet's movement, and these laws of sports have later inspired Newton to propose the law of gravity.

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