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Physics ~4 minKepler’s second law, angular momentum, orbits
Why Earth speeds up near the Sun
In January, Earth is about 5 million km closer to the Sun than in July. Does it move at the same speed?
Physics · ~4 min · live model
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The idea behind this lab (open after you’ve tried it)
Gravity pulls straight towards the Sun, so it cannot twist the orbit: distance times sideways speed stays fixed. Closer in, Earth must move faster.
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