The equatorial coordinate system projects Earth's latitude and longitude onto the celestial sphere, using declination (angular distance from the celestial equator, measured in degrees) and right ...

Yes, there are places on Earth where the Moon does not appear above the horizon. There are also places where the Moon is circumpolar and doesn’t set, at least for a period of time. To determine 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 ...

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 ...