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.
Create a custom, naked-eye map of the whole sky for any place on Earth, at any time of day or night, on any date from 1600 to 2400.
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.
Saturn (magnitude +0.4, in Ophiuchus above Scorpius) glows in the south-southwest at dusk. Antares twinkles 13° to Saturn's lower right.
Learn the phase of the Moon tonight, the day you were born, or on any historical date.
The planets are aligning! The week ahead will feature multiple planetary conjunctions at dawn and great views of Neptune and Triton at nightfall.
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.
Messier 17 (M17) has at least five proper names — Omega Nebula, Horseshoe Nebula, Checkmark Nebula, Swan Nebula, and the Lobster Nebula. Why so many?
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.
Point your telescope towards these doubles — true gems of the late-summer sky. You don’t even need dark skies or a big telescope to admire them!
Use our interactive observing tool to say which of the planet's four largest moons is which.
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 information on observing Jupiter during its 2016 - 2017 apparition, including information on its moons and Great Red Spot transit predictions.
Contributing Editor Ted Forte offers a look at Hickson Compact Groups in the November 2017 issue of Sky & Telescope. In 1982, Canadian astronomer Paul Hickson published a list of 100 compact galaxy groups based on his examination of the Palomar Observatory Sky Survey (POSS) red plates. A compact group, as defined by Hickson, is…
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.
Sky & Telescope Contributing Editor Ken Hewitt gives us a guided tour through Abell 194, a visually rich galaxy cluster in Cetus.
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.
In September's astronomy podcast, you'll learn what's special about the ringed planet Saturn, now visible in the evening sky.
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.
Use this telescope calculator to tell you how changing out eyepieces and accessories will affect your telescope's performance.
The waxing gibbous Moon is appears equally distant from Saturn, well to its right, and Altair, high to its upper left.
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.
The International Space Station passes over virtually all of Earth's populated areas, and you can spot it easily with your eyes alone — if you know where and when to look for it.
The International Space Station often passes close to the Moon, Sun, and naked-eye planets. Use this tool to plan viewing these close encounters.