Halfway between the celestial poles is the celestial equator, a projection of Earth’s equator onto the sky. The stars on the celestial equator rise due east and set due west. Delta Orionis, the ...

The autumn equinox is now upon us! Today marks the moment that the sun crosses the celestial equator, ushering in the beginning of astronomical autumn in the northern hemisphere, which brings with it ...

The Sun crosses the Celestial Equator this week, but what exactly does that mean? This week, we finally see the end of Winter, as the Vernal Equinox arrives to kick off the new season of Spring for ...

Length of day and night roughly equal as longer summer days draw near The sun crosses the celestial equator this week, meaning that the March equinox is upon us. The celestial equator is the ...

Today, I want to talk about the equatorial coordinate system. Start with this: What if we could project Earth’s coordinates of longitude and latitude into the sky? Latitude wouldn’t be a problem, but ...

It’s the time of the equinox or more specifically the spring equinox for us in the southern hemisphere. The equinox is a midpoint. It’s around now that day and night become equal in length (but more ...

Spot this large constellation with differing classical backstories as moon sits squarely in ‘teapot’ of Sagittarius This week we will look for another large but faint constellation: Ophiuchus, the ...

As someone who has spent thousands of hours observing the night sky, I like to think that I’m pretty familiar with it and able to navigate my way around with some ease. That’s certainly true on the ...