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Sky at a glance.

JULY 2013

3 Dusk: An hour after sunset, binoculars or a wide-field telescope may show that Venus, very low in the west-northwest, is on the edge of M44, the Beehive Cluster.

5 Earth is at aphelion, its farthest from the Sun for the year (3.3% farther than it is at perihelion in January).

15 Evening: Spica is very close to the first-quarter Moon as seen from the Americas. The Moon occults (covers) Spica in parts of Central and South America.

16 Evening: Saturn shines above the Moon, with Spica now to their right.

16, 17 Dawn: Jupiter and Mars have closed to just 2.2[degrees] apart, very low in the east-northeast an hour before sunrise. Binoculars or a telescope may show that the open star cluster Messier 35 is 1/2[degrees] above Mars.

21 Dusk: Look 1/4[degrees] lower left of Venus for much fainter Regulus very low in the west 45 minutes after sunset. Bring binoculars.

22 Dawn: Faint Mars glimmers 3/4[degrees] upper left of bright Jupiter low in the east-northeast an hour before sunrise. Best in binoculars and small telescopes.

Dusk: Regulus is again very near Venus--this time 1 1/4[degrees] below the planet.


Planet Visibility
SHOWN FOR LATITUDE 40[degrees] NORTH AT MID-MONTH
         SUNSET  MIDNIGHT                        SUNRISE
Mercury          Visible July 24 through August  E
                 16
Venus    W
Mars                                             E
Jupiter          Visible starting July 5         E
Saturn   SW      W

When
Late May      2 a.m. *
Early June    1 a.m. *
Late June   Midnight *
Early July    H p.m. *
Late July         Dusk
* Daylight-saving time.

RELATED ARTICLE: Using the Map

Go out within an hour of a time listed to the right. Turn the map around so the yellow label for the direction you're facing is at the bottom. That's the horizon. Above it are the constellations in front of you. The center of the map is overhead. Ignore the parts of the map above horizons you're not facing.

EXACT FOR LATITUDE 40[degrees] NORTH.

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Title Annotation:OBSERVING
Publication:Sky & Telescope
Article Type:Calendar
Geographic Code:1USA
Date:Jul 1, 2013
Words:331
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