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Another great explanation of Friday’s equinox – plus beautiful graphics – from astronomer Guy Ottewell.
2017’s September equinox arrives on the 22nd. Happy autumn (or spring)!
Long-period comet C/2017 O1 – a visitor from the Oort Comet Cloud – is becoming visible in small telescopes and binoculars. This post includes charts that can help you find it.
On the day of an equinox, the center of the sun would set about 12 hours after rising – given a level horizon, as at sea, and no atmospheric refraction.
A whole series of awesome meteor showers is about to start. Click in for information on how to watch the Draconids, Orionids, Taurids, Leonids and Geminids!
The Andromeda galaxy is the closest spiral galaxy to our Milky Way and the most distant thing you can see with your eye alone. Find it in your night sky!
We’re near solar minimum, but the sun has been active! Click here for a video of solar flares so far in September, 2017 and for news for the sun’s most recent X-flare.
It’s easy! The Great Square of Pegasus consists of 4 stars of nearly equal brightness in a large square pattern. Once you find it, you can star-hop to other well-known sights in the sky.
Delta Cephei doubles in brightness every 5.36 days and thereby helped establish the known distance scale of our galaxy and universe.
Sunwatchers are still tracking those 2 large sunspot groups making their way across the Earth-facing side of the sun. Then yesterday there was an X-flare! Watch for possible auroras.
If you live in the U.S. or Canada, a peculiarly red moon – or very spectacular sunrise or sunset – might be due to smoke from wildfires. Click in for images from Earth and space.
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.
If you were looking with the eye alone, how far away in space would our planet Earth still be visible?
3122 Florence passed yesterday, biggest near-Earth object to pass so close in a century. Radar revealed 2 orbiting moons! Plus a chart that’ll help you spot the asteroid.
Jupiter and Saturn are evening planets. Venus, Mercury and Mars are morning planets. Watch for the close conjunction of Mercury and Mars around mid-September.
No matter where you live worldwide, Capricornus the Sea-goat climbs highest in the sky in early September. How to see it, and how a sea-goat came to reside among the stars.
While not one of the most conspicuous stars in the night sky, Alderamin – aka Alpha Cephei – is easy to spot, and is interesting for its rapid rotation on its axis.
In 2017, the autumnal equinox for the Northern Hemisphere comes on September 22. Official Harvest Moon is October 5, but the September 5-6 full moon shares the characteristics of a Harvest Moon.
What could be more fun on a cool, crisp autumn evening than a star party? Find a 2017 star party near you.
Will the sky on September 23, 2017 mirror “signs” from the Book of Revelation in the Bible? An astronomer responds.
Equinox sun rises due east, sets due west
Triple lightning hits the sea