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Check out other "Eyes on the Sky" videos

There's a lot of great information available from both timeless "Basics" astronomy videos, to the weekly Eyes on the Sky videos of the past. Check them out here.

This season's night-sky videos

What's up with the planets?

There's some big changes happening in the night sky with respect to where the planets are visible. Mercury marks off space in the early morning sky (look soon! It's quick!), Venus is sliding around the Sun and will be an 'evening star' in the next month or so, Mars is mozying its way above the horizon in the evening (for a looooong time), Jupiter will soon be jumping its way to an evening object, Saturn is slipping past the Sun - in the opposite direction of Venus! - and Uranus and Neptune are ideally placed for night-time viewing. 

Finder chart for Uranus and Neptune here.

See the link for more information on how to view the planets successfully.

Costume-changers in Cepheus

With Halloween this week, it is a great time to look at some stars that 'dress up' and change their appearance - though many of them do it quite regularly! Check out several easy-to-spot stars in Cepheus the King that are variable in nature, along with one that has a binary companion that's split in most any small telescope. 

Check out Chart #1 for a star map you can download of the Cepheus region. 

The AAVSO guide to Delta Cephei.

Partial solar eclipse: October 23

Lunar eclipses aren't terribly rare, but most people recognize they don't happen every month, so they look for them. But solar eclipses are even rarer than lunar ones, so when they happen, go look! This week offers a great opportunity for most of North America - check the map in the video for areas that can see it. Also, lots of resources here, such as:

Most importantly, watch the video below for how to view the Sun safely. There are several ways to view a partial eclipse safely without using a solar filter, but NEVER look directly at the Sun, and be sure to know that your method IS safe - this video shows you what's safe, and what's not.


This constellation harbors perhaps the most-observed spiral galaxy in the night sky: Messier 31. But that's not the only thing here - the brightest stars of Andromeda are fascinating in and of themselves. For example, ever hear of a mercury-manganese star? There's one in Andromeda. Another bright star here, while appearing as lovely double, is actually a quadruple system. Another is not much larger than our Sun, but is a lot hotter.

All that, plus tips on how to find that great galaxy lurking in the same line-of-sight from our perspective - learn all about them in the video above. And for a more detailed star chart you can print off to bring outside, see these free star maps here. Oh, and even if you know the mythology story about Andromeda, don't miss this week's "Astronomy Theater" - it's a quick and fun version of her story.

Lunar eclipse, Uranus opposition AND a minor meteor shower!

Well, it sure is a busy week for amateur astronomy! First, there is a lunar eclipse occurring; to find out the times you may be able to see it, click here.

Next, Uranus is at opposition this week. While not exactly the most exciting planet to view for features (there pretty much are no features to see), simply finding and observing the planet with your own eyes is exciting for many amateurs. The Moon passes right near Uranus during the eclipse, but the video above shows a neat trick to finding the planet easily with binoculars or a finderscope over the next few months.

And lastly, the Draconids. While not a major shower - and one that would normally get zero attention from me due to the full Moon phase this week - check for them during the eclipse when you're not looking at Luna. You might see a few with a radiant point in the Dragon. More tips on observing meteors here.

Mare Australe, Rupes Altai, and more lunar features

The major mare on the lunar surface are well known to observers, even if they don't know their names. The dark splotches can be seen naked eye from Earth compared to the brighter, craters areas. But there are some maria that are slightly hidden from view, and best seen only when the libration of the Moon causes it to "tilt" a bit more one way or the other.

Mare Australe gets the benefit of that tilting this week, as the southeastern edge of the Moon can be seen better than at other times. The dark lava of this often-unobserved mare is seen from an oblique angle, but most any small telescope can see it - look for it all week long.

Also in the southeast of the Moon is Rupes Altai - an escarpment, or cliff - that is over 400 kilometers long. Learn where to see this, along with a 'wavy line' caused by sunlight catching the tops of four other craters. What else is there to see? Deslandres, the crater "Hell" (yes really!), Clavius, Tycho, Landsberg, Reinhold and others. All easily spotted with a 60mm telescope or larger.

The stars and constellations of autumn

Summer leaves and autumn arrives early this week, and the familiar friends of summer like Sagittarius, Scorpius, and other southern night sky constellations will soon be gone from the evening sky. But replacing them are many autumn shapes such as the Great Square of Pegasus, and the Summer Triangle actually hangs around overhead and towards the west for the rest of this coming season. Learn how to find a whole bunch of constellations and the brighter stars of autumn simply by pointing to those shapes from the Triangle or Square stars. It's easy! Dave will show you how in this week's Eyes on the Sky episode.