12/9/2022 0 Comments Moon elongation angle(Looking at directly at the sun is not recommended!)įor instance, if the sun and a planet are at the same point then the elongation is 0°. Measuring the angle between the two lines gives you the elongation of Venus. Then you would draw a line pointing to Venus and a line pointing to the sun. To measure the elongation of Venus, you could hold a piece of paper so that its flat edge is in line with the two objects. Imagine that you could see Venus and the sun at the same time. Elongation is the angle between the sun and a planet as seen by an observer on earth. He determined these things by measuring elongation. One may wonder how Copernicus determined the order of the planets and the size of their orbits – after all, he had no benefit of pictures from spacecraft or even a telescope. In Copernicus's heliocentric model the planets orbit in circles around the sun.
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