如何计算Angular Size
learn.whatIsHeading
Angular size (apparent size in sky) depends on object actual size and distance: θ ≈ size / distance (small angle approximation).
分步指南
- 1Input actual size and distance
- 2Calculate angular size in degrees, arcminutes, or arcseconds
- 3Compare to other celestial objects
例题解析
输入
Moon: ~3476 km diameter, 384,000 km distance
结果
Angular size ≈ 0.52° (match Sun size, hence solar eclipses)
常见错误注意事项
- ✕Confusing angular and actual size
- ✕Forgetting distance effect on apparent size
常见问题
Why do Moon and Sun look same size?
Coincidence: Sun 400× larger but 400× farther away.
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