The Ecliptic crosses the celestial equator at two points. One point marks the Vernal (or spring) Equinox and the other the Autumnal (or fall) Equinox.

On the morning of September 8, a spectacular total lunar eclipse (Blood Moon) will occur, visible across various regions in ...

Today, I want to talk about the equatorial coordinate system. Start with this: What if we could project Earth's coordinates ...

Because of that, the sun’s path among the backdrop of stars, known as the ecliptic, is inclined to the celestial equator by that same 23.5 degrees.

On Wednesday, September 22, the sun will cross the celestial equator while moving south along its yearly path called the ecliptic. The moment of crossing marks the autumnal equinox and the start ...

Importantly, the ecliptic is tilted relative to the celestial equator. This is because the Earth spins on an axis that is titled by 23.5° relative to its orbital plane.

Celestial Happening this week: The winter solstice is during the afternoon of Wednesday, Dec. 21, and it’s the astronomical first day of winter and the shortest day of the year.