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Home Q & A Board Science-Related Homework Help Physics
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askhan askhan
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11 years ago
"The distance to the Moon was measured a long time ago by using the idea of parallax. If the parallax angle measured is 0.3° for a displacement across the Earth of 2000 km, then the distance of the Moon is calculated to be what?"


Can someone please help me with how to solve problems like these?
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#1
11 years ago
Basically you make a triangle with a base of  2,000 km with an apex angle of 0.3°. To calculate the height H divide that angle by 2 and the base by 2 then the  tan 0.15° = 1,000/H
H =  1,000/tan 0.15° = 382,000 km
382,000 km
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