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    Articles > September 2021
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Guide to the Night Sky 2021
2021 Guide to the Night Sky

A monthly guide to the night sky in 2021 with star charts, sky calendar, planet data, moon phases, and meteor showers.
More info | Buy now


All sky watchers need a planisphere to quickly show the location of stars and constellations for any date and time. Note: Planispheres are designed for specific latitudes so be sure to select one for your latitude.

Guide to the Stars

(5th Edition, Jan. 2013)
A very large 16-inch diameter information-rich planisphere (plastic) for use anywhere between latitude 30° & 60° North. Also available in a Southern Hemisphere edition.
More info | Buy now

200+ Customer Reviews

More Planispheres

The Night Sky Planisphere

A very popular 8-inch diameter, two-sided planisphere (plastic) designed to depict the night sky with less distortion than regular planispheres. Available for several latitudes, and in a smaller 5-inch edition.
More info | Buy now
• Only $11.95 •

150+ Customer Reviews

Night Sky Editions
Latitude 20° to 30° North
Latitude 30° to 40° North
Latitude 40° to 50° North
Latitude 50° to 60° North
Southern Hemisphere
(more info)

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  Sky Calendar -- September 2021
2 Moon near Castor at 23h UT (morning sky).
3 Moon near Pollux at 5h UT (morning sky).
4 Moon near Beehive cluster M44 at 7h UT (morning sky).
Beehive Cluster (Wikipedia)
M44: The Beehive Cluster (APOD)
5 Venus 1.6° NNE of Spica at 21h UT (evening sky). Mags. −4.1 & 1.0.
6 Moon near Regulus at 0h UT (14° from Sun, morning sky).
Regulus (Wikipedia)
7 New Moon at 0:51 UT. Start of lunation 1221.
9 Moon near Mercury at 2h UT (evening sky). Mag. 0.1.
Mercury (Wikipedia)
9 Moon near Spica at 22h UT (evening sky).
Spica (Wikipedia)
10 Moon near Venus at 6h UT (evening sky). Mag. −4.1.
Venus (Wikipedia)
10 Asteroid 2 Pallas at opposition at 17h UT (evening sky). Mag. 8.6.
2 Pallas (Wikipedia)
11 Moon at perigee (closest to Earth) at 9:53 UT (distance 368,461 km; angular size 32.4').
13 Moon near Antares at 3h UT (evening sky).
Antares (Wikipedia)
13 First Quarter Moon at 20:40 UT.
14 Mercury at greatest elongation east at 4h UT (27° from Sun, evening sky). Mag. 0.2
14 Neptune at opposition at 9h UT. Mag. 7.8.
Neptune (Wikipedia)
17 Moon near Saturn at 5h UT (evening sky). Mag. 0.4.
Saturn (Wikipedia)
18 Moon near Jupiter at 10h UT (evening sky). Mag. −2.8.
Jupiter (Wikipedia)
20 Full Moon at 23:54 UT.
21 Mercury 1.4° SSW of Spica at 15h UT (25° from Sun, evening sky). Mags. 0.4 and 1.0.
22 September equinox at 19:22 UT. The time when the Sun reaches the point along the ecliptic where it crosses into the southern celestial hemisphere marking the start of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.
Equinox (Wikipedia)
26 Moon near the Pleiades at 3h UT (morning sky).
The Pleiades (Wikipedia)
26 Moon near Aldebaran at 21h UT (morning sky).
Aldebaran (Wikipedia)
26 Moon at apogee (farthest from Earth) at 22h UT (distance 404,640 km; angular size 29.5').
29 Last Quarter Moon at 1:57 UT.
30 Moon near Castor at 8h UT (morning sky).
30 Moon near Pollux at 13h UT (morning sky).
All times Universal Time (UT).
  • US Eastern Daylight Time = UT − 4 hours.
  • US Pacific Daylight Time = UT − 7 hours.
  • Australian Eastern Standard Time = UT + 10 hours
  • Singapore Standard Time = UT + 8 hours.

Clear skies till next month!

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