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This Week’s Sky at a Glance, April 21 – 29

21 Apr 2017, 09:12 UTC
This Week’s Sky at a Glance, April 21 – 29
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Mars is passing the Pleiades. They appear closest together April 19–21. After that the cluster moves lower. (For clarity, the Pleiades are always slightly enlarged in these illustrations.)
Meanwhile on the other side of the sky, sail-shaped Corvus sits to the right of Spica and Jupiter.
As the Moon wanes toward new it passes Venus in the dawn . . .
. . . and then the waxing crescent returns to the western evening sky.
Friday, April 21
• As night descends, look high in the west for Pollux and Castor lined up almost horizontally (depending on your latitude). These two stars, the heads of the Gemini twins, form the top of the enormous Arch of Spring. To their lower left is Procyon, the left end of the Arch. Farther to their lower right is the other end, formed by Menkalinan (Beta Aurigae) and then brilliant Capella. The whole thing sinks in the west through the evening.
• The weak Lyrid meteor shower should peak in the hours before Saturday's dawn. The Moon will be only a waning crescent. The shower's peak usually lasts just a few hours, but this year the predicted timing (12h Universal Time April 22) is ...

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