== Answer ==
A perihelion is the point when a planet, or anything else that could orbit a star, is closest to it, as very few celestial objects , if any, have exactly circular orbits.
Since planets typically orbit their stars in elipses, there is a point in which it is closest, and another point in which it is farthest, from the star. The planet perihelion is when the planet is...
When an object is closest to the Sun in its orbit around the Sun, that is called perihelion; the farthest point in the orbit is called aphelion. The generic names (making reference to any central...
Always some time in the first few days of January. In 2010, it was in the 7 PM hour EST on January 2. Perihelion is a place. It's the point in the earth's orbit that's closest to the sun.