Tonight's Sky
Sun
Sun
Moon
Moon
Mercury
Mercury
Venus
Venus
Mars
Mars
Jupiter
Jupiter
Saturn
Saturn

Tonight's Sky — Change location

OR

Searching...

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

° '
° '

The final lunar eclipse of 2013

Dedicated observers may catch the Moon’s face in shadow October 18.
RELATED TOPICS: MOON | LUNAR ECLIPSE
Penumbral Lunar Eclipse
This photographer captured the penumbral eclipse of April 25, 2013, from Lossiemouth, Scotland.
Alan C. Tough
On Friday, October 18, skywatchers across the Western Hemisphere should be on the lookout for a slight darkening of our nearest celestial neighbor’s face. A penumbral eclipse of the Moon begins at 5:51 p.m. EDT, reaches maximum at 7:50 p.m. EDT, and ends at 9:50 p.m. EDT.

A penumbral eclipse occurs when the Moon passes through the less dark outer portion of Earth’s shadow, which astronomers call the penumbra. (The dark inner part of the shadow is the umbra.) In fact, the penumbra is so slight that you won’t see any shading for roughly the first hour. And any clouds — even thin ones — will hamper the view greatly.

You’ll also need a fairly unobstructed horizon. That’s because only Moon-watchers in Europe, Africa, and the eastern parts of Canada and South America will be able to see the entire event. For those of us in the rest of Canada, the United States, Mexico, and western South America, moonrise will happen with the eclipse already in progress.

Look for unusual shading on the Moon’s southern half. The edge there will be the darkest because that part of the Moon is closest to the center of Earth’s umbra. If you pay attention, you can watch the Moon move through Earth’s shadow. Although our lone natural satellite appears to rise in the east and set in the west each day, that motion is an illusion caused by Earth’s rotation. The Moon actually travels through our sky from west to east. That means that as you watch this eclipse, the shadow will appear to move from left to right (east to west) across the Moon’s face.

This event should whet your appetite for the next lunar eclipse — a much more dramatic total — that will be visible across North America six months from now, April 14/15, 2014.
0

JOIN THE DISCUSSION

Read and share your comments on this article
Comment on this article
Want to leave a comment?
Only registered members of Astronomy.com are allowed to comment on this article. Registration is FREE and only takes a couple minutes.

Login or Register now.
0 comments
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter.

ADVERTISEMENT
ADVERTISEMENT
BoxProductcovernov

Click here to receive a FREE e-Guide exclusively from Astronomy magazine.

Find us on Facebook

Loading...