西宁到玉树的班车:This Week's Sky at a Glance for March 25 – April 2.

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This Week's Sky at a Glance

Some daily events in the changing sky for March 25 – April 2.

by Alan M. MacRobert

Friday, March 25

  • Saturn shines in theeast-southeast these evenings, with Spica below it. Far left of themsparkles brighter Arcturus. Less far to their right or lower right, lookfor the four-star pattern of Corvus, the Crow.

    Saturday, March 26

  • Last-quarter Moon (exactat 8:07 a.m. EDT). The half-lit Moon rises in the middle of the nightand is high in the south before sunrise.

    Sunday, March 27

  • The Big Dipper now standson its handle high in the northeast right after dark. Its topmost twostars, the Pointers, point left or lower left toward Polaris, the NorthStar, about three fist-widths at arm's length from them.
  • Algol is sinking down in the northwest these evenings. Still, if you'rein the Eastern or Central time zones for North America, you should haveno trouble spotting Algol at minimum light, magnitude 3.4 instead ofits usual 2.3, for a couple hours centered on 8:27 p.m. EDT.

    Earlyrisers can watch the crescent Moon passVenus as it wanes this week.(This scene is drawn for the middle of North America. Europeanobservers: move each Moon symbol a quarter of the way toward the one forthe previous date.)Sky & Telescope diagramMonday, March 28

  • A small telescope will alwaysshow Titan, Saturn's largest moon. Tonight Titan is at maximumelongation, appearing four ring-lengths to Saturn's east. A 6-inchtelescope will begin to show the orange color of its smoggy atmosphere.Saturn's other major moons are all close to the planet tonight.

    Tuesday, March 29

  • The fast-changing doublestar Gamma Virginis or Porrima, fairly conspicuous to the naked eyeclose to Saturn, has become resolvable again in medium-size amateurtelescopes this year on nights of good seeing. Its two equal componentsappear 1.7 arcseconds apart this season. See the article in the April Sky & Telescope, page 56.

    Wednesday, March 30

  • In early dawn Thursdaymorning, look low in the east-southeast for Venus lower right of thewaning crescent Moon, as shown above. Can you follow them all the waythrough sunrise?

    Thursday, March 31

  • At dawn Friday morning, North Americans now see the thin crescent Moon 13° or 14° left of Venus.

    Orion, with belt horizontal, was declining in the southwest when S&T's Tony Flanders took this 15-second exposure with a Canon A80 pocket digital camera.S&T: Tony FlandersFriday, April 1

  • Early spring is when Oriontilts downward in the southwest after dark, with his three-star belthorizontal as shown at right (for north temperate latitudes). Orion'sBelt points left toward bright Sirius (out of the photo) and to theright more or less toward orange Aldebaran (ditto). Farther to the rightfrom Aldebaran are the Pleiades.

    Saturday, April 2

  • Sirius, the Dog Star, isthe brightest star shining in the south-southwest after dusk. At adistance of only 8.6 light-years, it's the nearest thing outside oursolar system that's visible to the naked eye from Earth's mid-northernlatitudes. Look high above Sirius for Procyon, the Little Dog Star, notmuch farther away at 11 light-years.

    • This Week's Sky at a Glance for March 25 – April 2. This Week's Sky at a Glance for March 4 – 12 This Week's Sky at a Glance for March 18 – 26 This Week's Sky at a Glance for April 8 – 16 This Week's Sky at a Glance for April 15 – 23 This Week's Sky at a Glance for April 22 –30 This Week's Sky at a Glance February 25 – March 5. This Week's Sky at a Glance for June 17 – 25 This Week's Sky at a Glance April 1 – 9 This Week's Sky at a Glance for December 31 – January 8 This Week's Sky at a Glance for January 7 – 15. This Week's Sky at a Glance for January 14 – 22 This Week's Sky at a Glance for January 21 – 29 This Week's Sky at a Glance for January 28 – February 5 This Week's Sky at a Glance for February 4 – 12 This Week's Sky at a Glance for February 18 – 26. This Week's Sky at a Glance for May 20 – 28 This Week's Sky at a Glance for May 27 – June 4. This Week's Sky at a Glance for June 3 – 6 This Week's Sky at a Glance for July 29 – August 6 This Week's Sky at a Glance for September 8 – 17 This Week's Sky at a Glance for September 16 – 24 This Week's Sky at a Glance for June 24 - July 2 This Week's Sky at a Glance - SkyandTelescope.com