Some daily events in the changing sky for September 4 12.
Friday, Sept. 4
Saturday, Sept. 5
Sunday, Sept. 6
Monday, Sept. 7
Tuesday, Sept. 8
Wednesday, Sept. 9
Thursday, Sept. 10
Friday, Sept. 11
Saturday, Sept. 12
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 each issue of Sky & Telescope, the essential magazine of 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 Sky Atlas 2000.0 or the smaller Pocket Sky Atlas) and good deep-sky guidebooks (such as Sky Atlas 2000.0 Companion by Strong and Sinnott, the more detailed and descriptive Night Sky Observer's Guide by Kepple and Sanner, or the classic Burnham's Celestial Handbook). Read how to use them effectively.
Can a computerized telescope take their place? I don't think so not for beginners, anyway, and especially not on mounts that are less than top-quality mechanically. As Terence Dickinson and Alan Dyer say in their 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 and a curious mind." Without these, "the sky never becomes a friendly place."
More beginners' tips: "How to Start Right in Astronomy".
This Week's Planet Roundup
Mercury is lost in the sunset.
Venus (magnitude 3.9, in Cancer) blazes in the east before and during dawn.
Mars (magnitude +1.0, in the feet of Gemini) rises around 1 a.m. and is high in the east before dawn. In a telescope it's still only 6 arcseconds wide: a tiny, fuzzy blob. Mars is on its way to an unremarkable opposition late next January, when it will grow no larger than 14 arcseconds wide.
Jupiter (magnitude 2.8, in Capricornus) comes into view in the southeast as twilight fades the first "star" to appear after sunset. It's higher in better telescopic view by 10 p.m. Jupiter's recent impact mark had faded from view; see our article.
Saturn is hidden deep in the sunset. Too bad; on September 4th its rings turned edge-on to Earth.
Uranus (magnitude 5.7, just below the Circlet of Pisces) is well up in the southeast by 10 p.m.
Neptune (magnitude 7.8, in Capricornus) appears 5° or 6° east of Jupiter and nearly 20,000 times fainter. See our finder charts for Uranus and Neptune.
Pluto (14th magnitude, in northwestern Sagittarius) is still well up in the south-southwest right after dark. See the finder chart in the June Sky & Telescope, page 53. Good luck.
All descriptions that relate to your horizon or zenith 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.
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.