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    Articles > May 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
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Latitude 30° to 40° North
Latitude 40° to 50° North
Latitude 50° to 60° North
Southern Hemisphere
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  Sky Calendar -- May 2021
3 Last Quarter Moon at 19:51 UT.
3 Moon near Saturn (morning sky) at 20h UT. Mag. 0.7.
Saturn (Wikipedia)
5 Moon near Jupiter (morning sky) at 1h UT. Mag. −2.2.
Jupiter (Wikipedia)
5 Eta Aquarid meteor shower peaks at 19h UT. Most active for 7 days around this date. Associated with Comet Halley. Very fast, bright meteors, up to 40 per hour. Favors skywatchers in the tropics and southern hemisphere observing a few hours before dawn.
Eta Aquariids (Wikipedia)
2021 Meteor Shower Calendar (PDF) (IMO)
11 New Moon at 19:00 UT. Start of lunation 1217.
11 Moon at apogee (farthest from Earth) at 22h UT (distance 406,512 km; angular size 29.4').
12 Moon near the Pleiades at 15h UT (9° from Sun, evening sky).
The Pleiades (Wikipedia)
12 Moon near Venus (12° from Sun, evening sky) at 23h UT. Mag. −3.9.
Venus (Wikipedia)
13 Moon near Aldebaran at 9h UT (evening sky).
Aldebaran (Wikipedia)
13 Moon near Mercury (22° from Sun, evening sky) at 20h UT. Mag. 0.1.
Mercury (Wikipedia)
16 Moon near Mars (48° from Sun, evening sky) at 6h UT. Mag. 1.7.
Mars (Wikipedia)
16 Moon near Castor at 20h UT (evening sky).
17 Moon near Pollux at 1h UT (evening sky).
17 Venus 5.8° N of Aldebaran at 4h UT (15° from Sun, evening sky). Mags. −3.9 and 0.9.
17 Mercury at greatest elongation east (22° from Sun, evening sky) at 6h UT. Mag. 0.5
18 Moon near Beehive cluster M44 (evening sky) at 4h UT. The Beehive is lovely sight in binoculars.
Beehive Cluster (Wikipedia)
M44: The Beehive Cluster (APOD)
19 First Quarter Moon at 19:12 UT.
19 Moon near Regulus at 22h UT (evening sky).
Regulus (Wikipedia)
23 Moon near Spica at 19h UT (evening sky).
Spica (Wikipedia)
26 Moon at perigee (closest to Earth) at 1:46 UT (distance 357,311 km; angular size 33.4').
26 Full Moon at 11:14 UT. Perigee only 9.5 hours earlier.
26 Total Eclipse of the Moon begins at 11:11 UT and ends at 11:26 UT. Mid-eclipse at 11:20 UT. Partial phases begin at 9:45 UT and end at 12:52 UT. During totality the Moon will turn red-orange in color as it passes into the Earth's shadow. Light passing through the Earth's atmosphere scatters into red colors (same as sunset/sunrise) and reflects off the lunar surface.
Total Lunar Eclipse of 2021 May 26 (PDF) (NASA)
Eclipses of the Moon (Mr Eclipse)
NASA Lunar Eclipse Page (NASA)
26 Moon near Antares at 20h UT (midnight sky).
Antares (Wikipedia)
29 Mercury 0.40° SE of Venus (17° from Sun, evening sky) at 4h UT. Mags. 2.3 and −3.9.
31 Moon near Saturn (morning sky) at 4h UT. Mag. 0.6.
Saturn (Wikipedia)
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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