Perihelion position occurs approximately two weeks after December solstice, that is, in the first two weeks of the month of January.
Perihelion is the point of the earth's orbit when the earth is closest to the sun. On the other hand, we have the aphelion, which is the point of the earth's orbit when the earth is farthest from the sun. The names have been derived from Greek words "helios" which means Sun, "peri" which means close and "apo" which means far.
The earth revolves around the sun in an elliptical orbit. The earth is nearest to the sun in the month of January while it is farthest in the month of July.
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