How To Measure Distances In The Sky

how to learn stargazing

Measure great distances in the sky with your hand !

how to measure distances in the sky 1 5
how to measure distances in the sky 10 20

Image courtesy of ABC Science


Extend your arm and point your little finger. You can measure the distance and the apparent size of an object equivalent to 1°


If you extend your arm and raise three fingers, you can measure a distance between objects or the apparent size of an object of 5°

10°
Your fist is about 10°. If you extend your arm and your fist fills the distance between Jupiter and the Moon, then it is 10°.

20°
Extending your arm in front of you and unfolding your fingers, you can measure a distance of about 20°.

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