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Association of Bangalore Amateur Astronomers

Sun's Angualr size as seen from different planetary distances

28 Sep 2012, 10:14 UTC
Sun's Angualr size as seen from different planetary distances
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When we look at the sun, we always wonder how big it would appear looking at it from different planets. I have made this Image to show the relative size of Sun as seen from different planetary distances (scroll down after the table). The angular size of Sun with respect to distance is easy to calculate. Divide diameter of Sun by its distance form earth and then multiply the result by 57.3 to get the angular size of sun. Using this we can get angular size of Sun from different planets...Angular size = diameter/distance * 57.3Diameter of Sun = 1391000kmDistance from Earth = 150000000km Angular size = 1391000/150000000= 0.0092 * 57.3Angular size of Sun as seen from earth = 0.531degrees.We can calculate and compare the relative angular size of Sun seen from different planetary distances. Sun Diameter = 1391000 kilometers Planets Distance from Sun (when planet is closest to sun) Angular diameter(in degrees) Mercury 46000000 1.73 Venus 107000000 0.74 Earth 150000000 (mean distance) 0.53 Mars 206000000 0.38 Jupiter 740000000 0.10 Saturn 1352000000 0.05 Uranus 2741000000 0.029 Neptune 4444000000 0.017 Here is the a graphic of sun's appearance at different distances...

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