This week we can see something that many beginning sky watchers miss. I say we can “see” it, but in reality, it’s invisible except in our imaginations. The planets orbit our sun, and the moon orbits ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Of the imaginary coordinate lines that astronomers and navigators use in mapping the sky, perhaps ...

We’re getting a great gift in our skies this holiday season with three bright planets — Saturn, Jupiter and Mars — decorating our evening skies. We also have some nice celestial conjunctions, or what ...

The ecliptic is the path the sun, moon, and planets take across the sky as seen from Earth. It defines the plane of the Earth's orbit around the sun. The name "ecliptic" comes from the fact that ...