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    Articles > April 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 -- April 2021
2 Moon near Antares at 0h UT (morning sky).
Antares (Wikipedia)
4 Last Quarter Moon at 10:03 UT.
6 Moon near Saturn (morning sky) at 11h UT. Mag. 0.8.
Saturn (Wikipedia)
7 Moon near Jupiter (morning sky) at 11h UT. Mag. −2.1.
Jupiter (Wikipedia)
11 Moon near Mercury (8° from Sun, morning sky) at 10h UT. Mag. −1.2.
Mercury (Wikipedia)
12 New Moon at 2:32 UT. Start of lunation 1216.
14 Moon at apogee (farthest from Earth) at 18h UT (distance 406,119 km; angular size 29.4').
15 Moon near the Pleiades at 9h UT (evening sky).
The Pleiades (Wikipedia)
16 Moon near Aldebaran at 3h UT (evening sky).
Aldebaran (Wikipedia)
17 Moon near Mars (59° from Sun, evening sky) at 13h UT. Mag. 1.5. Occultation visible from SE Asia.
Mars (Wikipedia)
Occultation of Mars (IOTA)
19 Mercury at superior conjunction with the Sun at 2h UT. The elusive and innermost planet passes into the evening sky.
19 Moon near Castor at 14h UT (evening sky).
19 Moon near Pollux at 19h UT (evening sky).
20 First Quarter Moon at 6:59 UT.
20 Moon near Beehive cluster M44 (evening sky) at 21h UT.
Beehive Cluster (Wikipedia)
M44: The Beehive Cluster (APOD)
22 Lyrid meteor shower peaks at 13h UT (variable). Active April 14-30. Radiant is between Hercules and Lyra. Expect 10 to 20 bright, fast meteors per hour at its peak. Best observed after the Moon has set.
Lyrids (Wikipedia)
2021 Meteor Shower Calendar (PDF) (IMO)
22 Moon near Regulus at 14h UT (evening sky).
Regulus (Wikipedia)
26 Moon near Spica at 8h UT (evening sky).
Spica (Wikipedia)
27 Full Moon at 3:32 UT.
27 Mars 0.6° N of M35 cluster at 7h UT (55° from Sun, evening sky). Mag. 1.5.
M35 Cluster (Wikipedia)
27 Moon at perigee (closest to Earth) at 15:20 UT (distance 357,378 km; angular size 33.4').
29 Moon near Antares at 9h 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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