SUNSET: 
Ride "Big Blue" to Places You Never Knew
What does the sky look like through a 36-inch telescope? I found out at Ohio's Hidden Hollow Star Party last week. Here's my report and a few observing targets to share.
Stargazer's Corner: Adventures Under the Night Sky
An Ancient Eclipse in Ithaca
During the author's May 2017 trip to Kefalonia he learned of an ancient eclipse on the neighboring island of Ithaca with ties to the Odyssey.
This Week's Sky at a Glance, September 22 – 30
Friday, September 22 • Low in the west-southwest during twilight, spot the thin waxing crescent Moon. Can you see Jupiter to the lower right of it, by about 7°? (for North America.) • Equinox: Autumn begins in the Northern Hemisphere, and spring in the Southern Hemisphere, at 4:02 p.m.…
How to See and Photograph Geosynchronous Satellites
Dozens of satellites are busy day and night, beaming your favorite TV and radio programs from more than 35,000 miles away. Here's how to tune into them.
Astronomical Almanac
When do the Sun and Moon rise and set? When does twilight end and begin? Which planets are up? Start your night of observing with our Astronomical Almanac.
This Week's Sky at a Glance, September 15 – 23
Saturn (magnitude +0.4, in Ophiuchus above Scorpius) glows in the south-southwest at dusk. Antares twinkles 13° to Saturn's lower right.
Find the Phase of the Moon
Learn the phase of the Moon tonight, the day you were born, or on any historical date.
Dawn Dances, Neptunian Nights, and Eclipse Essence
The planets are aligning! The week ahead will feature multiple planetary conjunctions at dawn and great views of Neptune and Triton at nightfall.
Meet the New Interactive Sky Chart!
Our new-and-improved interactive sky chart is here — create and print a customized view of your night sky for any date, time, and location.
This Week's Sky at a Glance, September 8 – 16
Mercury and Mars are passing each other very low in the glow of sunrise, well to the lower left of Venus. Regulus is also with them, as shown in sky scenes here.
Find Jupiter's Moons - Interactive Observing Tool
Use our interactive observing tool to say which of the planet's four largest moons is which.
Transit Times of Jupiter's Great Red Spot
Calculate when the Great Red Spot will cross Jupiter's central meridian — that's the best time to see the famous storm through your telescope.
Find Saturn's Moons: Interactive Observing Tool and App
With help from our interactive JavaScript utility, you can always tell which of Saturn's brightest moons is which.
The Elusive Moons of Uranus
Take the observing challenge: Find as many as five of the brightest moons of Uranus in a large backyard telescope using our interactive observing tool.
Track Triton, Neptune's Largest Moon
Triton, Neptune's largest moon, is a tricky find. Our Triton Tracker observing tool can help users of moderate to large telescopes spot this distant moon.
Tour September's Sky: Saturn Time!
In September's astronomy podcast, you'll learn what's special about the ringed planet Saturn, now visible in the evening sky.
Mars Profiler: Which Side Is Visible?
To compare what you see on Mars with a map, you need to know which side of the planet you're looking at. Our handy Mars Profiler tells you that and more, for any date and time.
Telescope Calculator: How Does Your Telescope Perform?
Use this telescope calculator to tell you how changing out eyepieces and accessories will affect your telescope's performance.
This Week's Sky at a Glance, September 1 – 9
The waxing gibbous Moon is appears equally distant from Saturn, well to its right, and Altair, high to its upper left.
Asteroid Florence Pays Earth a Visit
Florence, one of the largest Earth-approaching asteroids, gets close enough to see in a small telescope this week and next. Here's how to find it.
