250,655 subscribers and counting ...
When you see the crescent moon after sunset this week, notice the pale glow on its unlit portion. This glow is called earthshine.
Venus reaches inferior conjunction today, officially leaving the evening sky. It has been low in the sky, where Earth’s atmosphere has caused Venus to scintillate, or twinkle, in many colors.
The planet Venus is now appearing in the west after sunset and in the east before sunrise. Don’t believe it? Astronomer Bruce McClure reports on his observation.
Brightest stars to the eye are 1st magnitude, and dimmest stars to the naked eye are 6th magnitude. How the magnitude scale works in astronomy and why it’s useful.
Here’s a fun activity for the coming months. Note how far the sun moves on your horizon each day, as spring shifts toward summer (or autumn towards winter).
The 2017 vernal or spring (or fall) equinox occurred on March 20 at 10:29 UTC. Spring for the north – fall for the south – of Earth’s globe.
We’re talking about the amount of time needed for the body of the sun to sink below the horizon. It’s true. The sun actually sets faster around the time of an equinox.
When a camera captures a star’s movement across the sky, it’s called a star trail. An astrophotographer explains how he does it.
All you need to know about the 1st total solar eclipse visible from the contiguous U.S. since 1979, from eclipse master Fred Espenak.
Here are 10 great viewing spots to watch the August 21, 2017 total solar eclipse, weather permitting.
Kochab and Pherkad in Little Dipper
See it! Meteors, moon, Venus photos