航空公司年终总结:This Week's Sky at a Glance for January 21 – 29

This Week's Sky at a Glance
Some daily events in the changing sky for January 21 – 29.
by Alan M. MacRobert
Nottill very late at night does the last-quarter Moon come up. Spot Saturnand Spica in its vicinity, along with an early preview of the springconstellation Corvus, the Crow.
Sky & Telescope diagram
Friday, January 21 After the Moon rises inmid-evening, look upper left of it for Regulus and, extending fartherupper left from there, the Sickle pattern in Leo.
Saturday, January 22
Just as the stars comeout in the fading twilight, Sirius rises above the east-southeasternhorizon. How early can you first spot it? Orion's Belt high above pointsdown nearly to the place to watch.
Sunday, January 23
The sky's biggestasterism (informal star pattern) — at least the biggest one that'swidely recognized — is the Winter Hexagon or Winter Circle. It fills thesky toward the east and south these evenings. Start with brilliantSirius at the bottom. Going clockwise from there, march through Procyon,Pollux and Castor, Capella high up, Aldebaran over to Capella's right,down to Rigel, and back to Sirius.
Monday, January 24
In the early hours of Tuesday morning, the waning Moon shines to the right of Saturn and Spica, forming a triangle with them.
Tuesday, January 25
Bright, familiarCassiopeia overhead is a telescopic playground of deep-sky objects — butso is the section of dim Camelopardalis just to its east. Explore thislesser-known region with Sue French's Deep-Sky Wonders article and mapin the JanuarySky & Telescope, page 58.
Wednesday, January 26
Left of Jupiter afterdinnertime is the Great Square of Pegasus. It's larger than your fistat arm's length and balanced on one corner. The Great Square lies midwayalong the long string of stars from Andromeda's foot to Pegasus's nose.This ragged line now runs nearly from the zenith down to the westhorizon, respectively.
Last-quarter Moon (exact at 7:57 a.m. Eastern Standard Time).
Thursday, January 27
The farthest-northpart of the ecliptic crosses the midline of the Milky Way near the feetof Gemini, the top of Orion's Club, and the horns of Taurus — abeautiful rich field for binocular cruising.
Earlyrisers can watch the waning Moon pass bright Venus, with Antares andScorpius looking on. (These scenes are drawn for the middle of NorthAmerica. European observers: move each Moon symbol a quarter of the waytoward the one for the previous date. The blue 10° scale is about thesize of your fist held at arm's length.)
Sky & Telescope diagram
Friday, January 28
Is your sky dark enoughfor you to see the Great Andromeda Galaxy? It's just off the knee of theAndromeda stick figure. The brighter, sharper bottom-point of theCassiopeia "W" points to it.
During dawn Saturday morning, the waning crescent Moon has bright Venus to its left, as shown above.
Saturday, January 29
During dawn Sunday morning, the thin waning Moon is below Venus.