Last updateTue, 18 Sep 2018 1pm


31 Oct 2017
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November 2017 features twilight planetary pairs—one in the morning, and one in the evening. Venus and Jupiter will appear close together low in the east-southeast morning twilight glow for a few mornings around Nov. 13, about 40-45 minutes before sunrise. In last 10 days of the month, Saturn and Mercury will appear within the same binocular field low in the southwest evening twilight glow, 40-45 minutes after sunset. Of the morning planets, dim, distant Mars rises in a dark sky all month, improving from 2.6 hours before sunup on Nov. 1, to 3.5 hours at month’s end. Mars glows at magnitude +1.8 to +1.7, about as faint as it ever gets. Brilliant Venus, of magnitude -3.9, rises in ever brighter twilight, 1.3 hours before sunup on the 1st, and about 45 minutes hour before sunup on the 30th. Watch for Venus’ rising 16 to 34 degrees to the lower left…
29 Sep 2017
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Rise early on these dark mornings, and you will be rewarded by a close planet pair, lots of bright stars, a star popping out from behind the moon, a meteor shower from Halley’s Comet, and a dust cloud in our solar system. Evenings give us Saturn with rings now open to the max, and the Milky Way. Our morning twilight all-sky chart for October 2017 at shows the changes in positions of naked-eye planets and stars of first magnitude or brighter at mid-twilight, when the sun is 9 degrees below the eastern horizon, some 40 minutes before sunrise. A bonus in October, while we’re still on daylight saving time: You don’t need to get up extra early by the clock to enjoy dark morning skies! As the month progresses, stars will appear to drift from east to west along the tracks shown, owing to the revolution of Earth around…
31 Aug 2017
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Our morning twilight all-sky chart for September, viewable below, shows the changes in positions of the naked-eye planets and the stars of first-magnitude or brighter, less than an hour before sunrise. Changes are caused by the motion of the Earth and the other planets in their orbits. Stars will appear to drift from east to west across the sky as weeks pass, thanks to the revolution of Earth around the sun. Venus now dominates the predawn sky, but is getting a little lower each morning, because it is heading toward the far side of the sun, where it will arrive in January 2018. Annually in September and October, the huge Winter Hexagon—in clockwise order from its brightest member, Sirius, Procyon, Pollux and Castor, Capella, Aldebaran and Rigel, with Betelgeuse inside—is well-placed high in the sky before dawn. The flashing blue-white Dog Star Sirius is its most prominent and southernmost member.…