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Posts by Bruce McClure

Image via Wikipedia
FAQs | Sep 20, 2014

Why aren’t day and night equal on the day of the equinox?

On the day of the equinox, the center of the sun would set about 12 hours after rising – given a level horizon, as at sea, and no atmospheric refraction.

Lunar eclipse illustration courtesy of Luc Viatour
FAQs | Sep 20, 2014

What is a Blood Moon?

A lunar tetrad – four total lunar eclipses in a row – began on the night of April 14-15. The next one will be on the night of October 7-8.

Mercury's evening apparition favors Southern hemisphere Read more
Tonight | Sep 20, 2014

Mercury’s September 2014 apparition favors Southern Hemisphere

Mercury, innermost planet of the solar system, swings to its greatest evening elongation – 26 degrees east of setting sun – on September 21, 2014.

Moon again with Jupiter on the morning of September 20 Read more
Tonight | Sep 19, 2014

Moon and Jupiter spectacular before dawn September 20

A beautiful crescent moon and very bright planet in the eastern predawn sky Saturday morning. Look for star Regulus, too. And Venus?

Moon with Jupiter in predawn and dawn sky September 19 Read more
Tonight | Sep 18, 2014

Moon and Jupiter before dawn September 19

See the moon near the dazzling planet Jupiter during the predawn and dawn hours on September 18 and 19, 2014. Just look east.

2013-sept-16-virgo-leo-sun-night-sky-chart
Tonight | Sep 17, 2014

Sun passes out of Leo and into Virgo on September 17

On September 17, 2014, the sun exits the constellation Leo and enters the constellation Virgo. The sun will stay in Virgo until it enters Libra on October 31.

Sunrise over the Red Sea by EarthSky Facebook friend Graham Telford
Tonight | Sep 16, 2014

Year’s fastest sunsets happen around the equinoxes

The sun sinks below the horizon faster around the September and March equinoxes than at any other time.

Great galaxy in Andromeda
Tonight | Sep 15, 2014

Andromeda galaxy is Milky Way’s next-door neighbor

At 2.3 million light-years, the Andromeda galaxy (M31) is the closest spiral galaxy to our Milky Way. It’s the most distant thing you can see with your eye alone.

09sep18_430
Tonight | Sep 15, 2014

Find the Lagoon and Trifid nebulae

Take a dip in the Lagoon and Trifid nebulae on these September evenings, especially if you’re in a place where you can see the starlit band of the Milky Way.

lights_tunnel_distance
Tonight | Sep 09, 2014

Star of the week: Delta Cephei is a famous variable star

Delta Cephei doubles in brightness every 5.36 days. This star and others like it have helped establish the known scale of our galaxy and universe.