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14h ago

September Skywatching: Harvest Moon, Venus at Peak Brightness and Neptune at Opposition

A month of steady celestial events gives casual observers clear dates to plan dark-sky nights and community telescope outings.

Venus (brighter object) shines next to the bright star Spica as dawn brightens the sky above the Salish Sea. Credit: M.E. Sanseverino (Flickr, CC BY-NC-ND 2.0)
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Overview

  • Early September delivers twilight highlights: brilliant Venus passes about a degree from the star Spica around Sept. 1 and the Aurigid meteor shower is predicted to peak the same day with a modest rate of meteors.
  • A predicted new moon on Sept. 10–11 creates the month's darkest nights and is the best window to view the Milky Way and faint deep-sky objects from low-light locations.
  • The minor Epsilon Perseids shower is forecast to peak around Sept. 9 with only a few meteors per hour, so patient observers in dark skies will have the best chance to see them.
  • Key planetary dates stack later in the month: Venus reaches peak brilliancy around Sept. 18, Neptune reaches opposition on Sept. 25–26 for its best annual viewing with binoculars or a small scope, and the full Harvest Moon occurs on Sept. 26 at 12:49 p.m. EDT with Saturn visible roughly an hour after moonrise.
  • The September calendar also marks the autumnal equinox on Sept. 22–23 and a seasonal shift in constellations from the Summer Triangle toward Pegasus and Andromeda, and astronomy groups and parks are offering public viewing events to help city residents access telescopes and darker horizons.