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Astronomy Essentials

Image Credit: Esparta
Tonight | Sep 21, 2014

Everything you need to know: September equinox

September equinox is Monday at 9:29 p.m. CDT (September 23 at 2:29 UTC).

Photo via Nezih Durmazlar
Tonight | Sep 09, 2014

Minor lunar standstill lessens impact of 2014 Harvest Moon

The diminished inclination of the moon’s orbit to Earth’s equator lessens the impact of this year’s Harvest Moon.

Photo Credit: Arby Reed
Tonight | Sep 09, 2014

Looking for a tide almanac? EarthSky recommends …

The tide almanacs recommended here are based on astronomical influences on the tides. They can help you know when to expect high and low tides.

Moon Sept. 18, 2013 by Amy Simpson-Wynne
Tonight | Sep 06, 2014

Everything you need to know: The super Harvest Moon of 2014

That bright moon now in the evening sky is waxing toward a Harvest Moon on the night of September 8-9. A super Harvest Moon!

Zodiacal light
Blogs | Aug 29, 2014

Everything you need to know: zodiacal light or false dawn

The zodiacal light is an eerie light extending up from the horizon. No matter where you are on Earth, springtime or autumn is the best time to see it.

Wikimedia Commons, Paul Stansifer, User:84
FAQs | Tonight | Aug 29, 2014

How far is a light-year?

Light is the fastest-moving stuff in the universe. It travels at an incredible 300,000 kilometers (186,000 miles) per second. So, in a year, light travels far.

Hoax image via social media.
Blogs | Tonight | Aug 27, 2014

No double moon on August 27

Will Mars and the moon will appear the same size on August 27, 2014? Gosh, no. What’s really amazing is the staying power of this 11-year-old hoax.

Young moon of March 31, 2014 by Ken Christison.
Blogs | Tonight | Aug 25, 2014

Longest lunar month of 2014 starts on August 25

The longest lunar month of 2014 starts with the August 25 new moon and ends September 24. All you need to know about the varying lengths of the lunar months, here.

Tonight | Aug 02, 2014

Top 7 tips to minimize moon and optimize 2014’s Perseid meteor shower

The August 2014 supermoon will do its best to drown out the 2014 Perseid meteor shower. Here are 7 tips for enjoying the Perseid meteors in 2014.

Perseid meteor
Tonight | Jul 24, 2014

Everything you need to know: Perseid meteor shower

In the N. Hemisphere, the annual August Perseid meteor shower ranks as the year’s favorite shower. A big, bright supermoon interferes in 2014. So start observing the Perseids soon!