Exactly when is the earth nearest the sun?

Around January 3 - 6. In 1998, for example, it will be January 5 at a distance of 0.9832988 AU or 147,099,000 kilometers. At that time the distance changes by 44,879 kilometers per day.

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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the
IMAGE/POETRY Education and Public Outreach program.