Astronomers don't know why Jupiter's iconic Great Red Spot has been gradually shrinking since the 1800s — or why the downsizing has accelerated during the past two years. Update: On May 15th, NASA released newly taken images of the Great Red Spot (at bottom below) to show its declining size since 1995. Thanks to...
Uranus and Neptune are easy to find with the aid of the charts in this article.
This star-studded pool of misty light provides a feast for observers.
Explore the Moon with binoculars or a telescope.
The King of Planets reached opposition in the first half of January but it's still big and bright, a captivating sight no matter how you look at it.
The two brightest asteroids are very close to each other in the sky in 2014, fitting in a single field of view through binoculars and some telescopes.
Sky & Telescope predicts that 2014's best meteor shower won't be one of the traditional displays. Instead, on May 24th the predawn skies over North America might come alive with a robust display of "shooting stars" shed by Comet 209P/LINEAR.
Thousands of telescopes are given and received as gifts during the holidays. But once you've assembled your new treasure, then what? The editors of Sky & Telescope show you where to look first.
Spot Uranus and Neptune, and relive the original discoveries.
The perpetuation of the supermoon myth is mostly motivated by desire for publicity. But much of what we call the supermoon is just our eyes playing tricks on us.
Saturn is an old favorite for every telescope user. Here's a guide to seeing all that you can see on the ringed planet.
Spectacular Saturn is a perennial favorite of telescope users everywhere. Click here to find printable data on the positions of Saturn's rings and planets.
When do the Sun and Moon rise and set? When does twilight end and begin? Which planets are up? Set our Online Almanac for your location!
Learn the phase of the Moon tonight, the day you were born, or on any historical date.
This interactive tool is designed to give you answers to your commonly asked questions about your telescope's performance when changing eyepieces and accessories.
Ceres, the biggest asteroid and brightest dwarf planet,shines at magnitude 6.9 or brighter from December 12-25.
Now you can calculate the dates and times (local and Universal Times) when the center of the Great Red Spot should cross Jupiter's central meridian, the imaginary line down the center of the planet's disk from pole to pole.
Click here to find the positions of Jupiter's moons and the Great Red Spot.
Here are a few hints to enhance your meteor-watching experience.
Meteor studies have relied heavily on amateur observers for more than a century. They still do. Here are some tips and suggestions on how to plan a meteor watch.
As the moon wanes in the gibbous phase in the nights to come, see if you can find and observe some of 100 of Charles Wood's classic lunar hit list, including craters, basins, mountains, rilles, and domes.
Meteors, meteoroids, meteorites, and fireballs — keep all these look-alike terms straight.
Mark your calendars for August 21, 2017 — when the Moon's umbral shadow will race coast to coast across the United States for the first time in nearly a century.
We'll see a "blue Moon" next Friday, but what does that mean? From the Middle Ages to the game of Trivial Pursuit, a folklorist explores the origin of the phrase.