SUNSET: 
A Harvest Moon Penumbral Eclipse
Skywatchers in the Eastern Hemisphere will see tonight's full moon skirt through Earth's dusky outer shadow.
This Week's Sky at a Glance, September 16 – 24
Parts of Europe, Africa, and Asia will see a penumbral lunar eclipse Friday. Eclipse or no, look for the Great Square of Pegasus to the Moon's upper left.
Why Are There So Many UFOs?
In an age when UFO sightings are rife, we look at other possibilities that may help to explain the strange apparitions many see.
This Week's Sky at a Glance, September 9 – 17
First-quarter Moon shines over Mars Friday evening. The triangle of Mars, Saturn, and Antares, continues to lengthen as summer nears its end.
Stargazer's Corner: Adventures Under the Night Sky
Econ 101: Protecting Acadia's Dark Skies
To help maintain the beautifully dark skies over Maine's Acadia National Park, this Master's thesis analyzed how the region's economy and other policy issues would be affected by stricter lighting regulations.
A Little Guide to Lunar Domes
With this week's waxing Moon, we set off to explore its volcanic past with a look at a dozen intriguing lunar domes.
This Week's Sky at a Glance, September 2 – 10
A Friday twilight challenge: Shortly after sunset, use binoculars to look for the super-thin crescent Moon near Jupiter and Venus just above the horizon.
Annular Solar Eclipse Wrap-Up
The annular solar eclipse visible over south-central African and parts of the Indian Ocean was a dazzling crowd pleaser!
Enjoy Orion in Shirtsleeves
Throw open the door and welcome back Orion at dawn. The Hunter's return brings relief from the heat and gives us a fresh shot at exploring untouched winter deep-sky objects in comfort.
Tour September's Sky: Mars, Saturn & Venus
Early evening features Mars and Saturn toward south, but keep an eye out for brilliant Venus climbing up from the west during twilight.
Thursday's Annular Solar Eclipse
The Sun's second coverup of the year will be an annular solar eclipse whose path crosses south-central Africa and northern Madagascar on September 1st.
This Week's Sky at a Glance, August 26 – September 3
Venus-Jupiter conjunction on Saturday: about 20 minutes after sunset, look above the western horizon, left of where the Sun went down. Bring binoculars.
Polarized Light: From Blue Sky to Egg Nebula
Bees see polarized light and use it to navigate to honey. Learn how you can use it to crack the Egg Nebula.
2017's Total Solar Eclipse: One Year to Go!
It's still a full year away, but next year's coast-to-coast solar eclipse is already a big deal with astronomers worldwide.
This Week's Sky at a Glance, August 19 – 27
Summer is on the decline, temperatures notwithstanding: when darkness falls, Cassiopeia has now risen as high in the northeast as the Big Dipper has sunk in the northwest.
Palling Around With Palomar Globular Clusters
The intriguing Palomar globular clusters will challenge observers with modest to large telescopes, while providing a satisfying ramble around the galactic halo.
Stargazer's Corner: Adventures Under the Night Sky
Amateurs Help Discover Pulsing White Dwarf
Amateur astronomers worked together with the pros in the discovery of the pulsing white dwarf in the variable system known as AR Scorpii. Hear from Josch Hambsch, one of the amateurs on the team, on what it was like to take part.
This Week's Sky at a Glance, August 12 – 20
This Friday, look lower right of the waxing gibbous Moon for the ever-changing Saturn-Mars-Antares triangle. Full Moon on Wednesday night.
Dark-Sky RV Parks in the U.S.
Watching the Perseids from an RV park? Find campgrounds with dark skies that are ideal for observing meteor showers and other celestial sights.
A Real Scorcher! — Sirius At Heliacal Rising
Make a connection to a time when stars were used to track seasons and predict natural events by watching the heliacal rising of Sirius.
