Saturday, June 29
Sunday, June 30
Zeta Lyrae is also a double star for binoculars; much tougher, but easily split with a telescope.
Monday, July 1
Tuesday, July 2
Thursday, July 4
Saturday, July 6
Want to become a better amateur astronomer? Learn your way around the constellations. They're the key to locating everything fainter and deeper to hunt with binoculars or a telescope.
For an easy-to-use constellation guide covering the whole evening sky, use the big monthly map in the center of each issue of Sky & Telescope, the essential guide to astronomy. Or download our free Getting Started in Astronomy booklet (which only has bimonthly maps).Once you get a telescope, to put it to good use you'll need a detailed, large-scale sky atlas (set of charts). The standards are the little Pocket Sky Atlas, which shows stars to magnitude 7.6; the larger and deeper Sky Atlas 2000.0 (stars to magnitude 8.5); and the even larger Uranometria 2000.0 (stars to magnitude 9.75). And read how to use sky charts with a telescope.
You'll also want a good deep-sky guidebook, such as Sue French's Deep-Sky Wonders collection (which includes its own charts), Sky Atlas 2000.0 Companion by Strong and Sinnott, the bigger Night Sky Observer's Guide by Kepple and Sanner, or the beloved if dated Burnham's Celestial Handbook.
Can a computerized telescope replace charts? Not for beginners, I don't think, and not on mounts and tripods that are less than top-quality mechanically (able to point with better than 0.2° repeatability). As Terence Dickinson and Alan Dyer say in their invaluable Backyard Astronomer's Guide, "A full appreciation of the universe cannot come without developing the skills to find things in the sky and understanding how the sky works. This knowledge comes only by spending time under the stars with star maps in hand."
This Week's Planet Roundup
Mercury is lost in the glare of the Sun.
Venus (magnitude –3.8) is gaining altitude very gradually, low in the west-northwest in evening twilight.
Mars and Jupiter are hidden in the glow of sunrise.
Saturn (magnitude +0.5, at the Virgo-Libra border) glows in the southwest after dark with slightly dimmer Spica 12° to its lower right. Look about equally far to Saturn's left for Alpha Librae.
See our telescopic guide "Scrutinizing Saturn" in the May Sky & Telescope, page 50, or the shorter version on our website. Identify Saturn's many moons at any time and date with our SaturnMoons utility or handier app.
Uranus (magnitude 5.8 in Pisces) and Neptune (magnitude 7.9 in Aquarius) are high in the southeast before the beginning of dawn. Finder charts for Uranus and Neptune.
All descriptions that relate to your horizon including the words up, down, right, and left are written for the world's mid-northern latitudes. Descriptions that also depend on longitude (mainly Moon positions) are for North America. Eastern Daylight Time (EDT) equals Universal Time (also known as UT, UTC, or GMT) minus 4 hours.
Like This Week's Sky at a Glance? Watch our SkyWeek TV short, also playing on PBS.
To be sure to get the current Sky at a Glance, bookmark this URL:
If pictures fail to load, refresh the page. If they still fail to load, change the 1 at the end of the URL to any other character and try again.