Every year in early January, Earth reaches the closest point in its orbit to the Sun, a moment astronomers call perihelion.

Here's how the astronomical phenomenon influences our planet—from the length of our seasons to the way Earth moves through ...

Perihelion is when a planet or celestial body reaches its closest point to the Sun in its orbit.

Add Yahoo as a preferred source to see more of our stories on Google. The sun shines above the Earth’s horizon. Perihelion, the point when Earth is closest to the Sun, occurs annually in early January ...