Most of us in North America are getting up an hour earlier this week thanks to the end of daylight saving time. If you're willing to get up a little earlier still this weekend, you will witness a celestial treat: a triple conjunction of the waning crescent moon, the brilliant planet Venus, and the brightest star in the constellation Virgo, called Spica.
Many people don't realize how fast the moon moves across the sky until it passes close by a bright landmark. In this case it will be moving past both Venus and Spica.
On Saturday morning (Nov. 10), the moon will be quite far to the right of Venus. On Sunday (Nov. 11), it will have moved much closer to Venus, forming a tight triangle with Venus and Spica. By Monday (Nov. 12), the moon will be well below and to the left of Spica —quite low in the sky and probably hard to see.
If you do spot the moon that day, look for Saturn just to its left, making its reappearance after a month or two on the far side of the sun. The moon is heading for an eclipse of the sun on Wednesday morning (Nov. 14), which will be a total eclipse only in northern Australia and the South Pacific Ocean, but a partial eclipse all over Australia, New Zealand, and southern South America. [Video: November 2012 Total Solar & Penumbral Lunar Eclipse]
During this time, take a close look at the moon to look for the dim side of its globe lit only by Earthshine, which is sunlight reflected from the Earth. If you do watch all three mornings, see if you can detect Venus' movement relative to Spica: the two bodies are getting closer, heading for a minimum distance on the morning of Nov. 17.
The view will be best Sunday morning, when the three are closest together, but worth a look any morning this weekend.
While you're up, set up your telescope and have a look at Porrima, the second brightest star in Virgo. It is a close double star requiring at least a 75mm telescope to see the two stars separately.
Many astronomers have forgotten that Porrima is a double star because it has been too close to split in even the largest telescopes in recent years, but it has now opened up enough to make a pretty sight at high magnifications.
November 2012 Night Sky Guide (Sky Map Gallery)
Solar Eclipses: An Observer's Guide (Infographic)
Best Telescopes for Beginners | Telescope Reviews & Buying Guide
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