Kepler discovered that area B = area C because of its similar distance of orbit from the sun.
What Kepler discovered?
A certain planet sweeps out an area B from the point P3 to P4 in a time t while on the other hand, for the same interval of time t, the planet sweeps out an area C from point P4 to P5, that is equal to the previous area according to second Kepler's law.
So we can conclude that Kepler discovered that area B = area C because of its similar distance of orbit from the sun.
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