equinox
Occultation Palooza: The Moon Covers Aldebaran and More
The Moon occults Aldebaran tonight, crosses the Hyades star cluster and more.
8 years ago
The Orbit of Earth. How Long is a Year on Earth?
Ever since the 16th century when Nicolaus Copernicus demonstrated that the Earth revolved around in the Sun, scientists have worked…
10 years ago
Precession of the Equinoxes
When he was first compiling his famous star catalogue in the year 129 BCE the Greek astronomer Hipparchus noticed that…
14 years ago