When we say an astronomical object is at opposition, we are saying it is opposite the sun’s position in the sky. When the sun is going down, the object at opposition is rising. At local midni

Perihelion and Aphelion times

Perihelion is when a planet or other object orbiting the sun is closest to the sun. Aphelion is when it’s farthest from the sun. Any object that’s not in a perfectly circular orbit wil

Mars disk

Mars’ seasons

Seasons on Mars aren’t much like they are on Earth. The red planet’s axial tilt is 25.19°. That’s slightly more than Earth’s. So the sun goes through equinox and solstices.

Earth’s Seasons

The March equinox occurs on March 20 at 10:29 Universal Time. People in the northern hemisphere usually call it the spring equinox. In the southern hemisphere, it’s the autumn equinox.