2021 Astronomical Event Calendar
Also see list of upcoming space launches.
Jan 2-3: Quadrantids meteor shower
Jan 13: New moon phase
Jan 24: Mercury at greatest eastern elongation
Jan 28: Full moon phase (Wolf Moon)
Feb 11: New moon phase
Feb 27: Full moon phase (Snow Moon)
Feb 18: NASA Perseverance Mars landing (Jezero Crater)
Mar 6: Mercury at greatest western elongation
Mar 13: New moon phase
Mar 20: Vernal (N) | autumnal (S) equinox (09:27 UTC)
Mar 20: Venus at greatest eastern elongation
Mar 28: Full moon phase (Worm Moon)
Apr 8: Full (super)moon phase (Pink Moon)
Apr 12: New moon phase
Apr 22-23: Lyrid meteors
May 10: OSIRIS-REx sample departure from asteroid Bennu
"mid-May": China Tianwen-1 Mars landing (Utopia Planitia)
Jun 10: New moon phase
Jun 10: Annular solar eclipse NASA eclipse map
Jun 21: Summer (N) | winter (S) solstice(03:21 UTC)
Jun 24: Full (super)moon phase (Strawberry Moon)
Jul 4: Mercury at greatest eastern elongation
Jul 10: New moon phase
Jul 24: Full moon phase (Buck Moon)
Jul 28-29: Delta Aquarids meteors
Jul 22: NASA DART launch to asteroids Didymos and Dimorphos
Jul TBA: Astrobotic Peregrine lunar landing
Aug 2: Saturn at opposition
Aug 8: New moon phase
Aug 12-13: Perseid meteors
Aug 19: Jupiter at opposition
Aug 22: Full moon phase (Blue Moon)
Sep 7: New moon phase
Sep 14: Neptune at opposition
Sep 14: Mercury at greatest eastern elongation
Sep 20: Full moon phase (Harvest Moon)
Sep 22: Autumnal (N) | vernal (S) equinox (19:11 UTC)
Oct 1: Luna 25 lunar landing
Oct 11: IM-1 Moon Mark lunar landing
Oct 16: NASA "Lucy" launch to multiple Jovian trojan asteroids
Oct 21: IXPE x-ray telescope launch
Oct 31: James Webb telescope launch
Nov TBA: XPoSat x-ray telescope launch
Nov TBA: NASA Artemis 1 lunar orbit
Dec 4: Total solar eclipse NASA eclipse map
Dec 4: New moon phase
Dec 13-14: Geminid meteors
Dec 19: Full moon phase (Cold moon)
Dec 21: Winter (N) | summer (S) solstice (15:50 UTC)
Dec 21-22: Ursid meteors
Apogee: point in the Moon's orbit when it is farthest from Earth.
Conjunction: Occurs when two or more bodies appear close together in the sky.
Elongation: is the apparent angular separation of an object from the Sun. Greatest elongation is best for viewing as it is at it's highest point above the horizon.
Inferior conjunction: When planet Mercury or Venus pass between the Sun and the Earth.
Occultation: Passage of one object in front of a smaller one, thus obscuring all or part of the background object from view.
Opposition: When a planet farther from the Sun than Earth appears opposite the Sun in the sky. This is the best time to observe a planet as it is closet to the Earth.
Perigee: point in the Moon's orbit when it is nearest to Earth.
Stationary: Object appears motionless in the sky due to the turning point between its direct and retrograde motion.
Blue moon: Second full moon to occur in a calendar month.
Find your inner astronomer. Your complete guide to amateur astronomy.