Astronomy Calendar

• 1
  The Moon at aphelion  Remind MeThe Moon passes its furthest point from the Sun, a monthly occurrence around the time of full moon.
• 2
  The Great Globular Cluster in Hercules is well placed  Remind MeThe Great Globular Cluster in Hercules (M13, NGC 6205; mag 5.8) culminates at around midnight local time.
  Lunar occultation of Sigma Sagittarii  Remind MeThe Moon will pass in front of Sigma Sagittarii (Nunki), creating a lunar occultation visible from countries and territories including Argentina, Antarctica, South Africa and Chile amongst others.
• 3
  Messier 12 is well placed  Remind MeThe globular cluster M12 (NGC 6218; mag 6.1) in Ophiuchus culminates at around midnight local time.
• 5
  Venus at highest altitude in evening sky  Remind MeVenus is bright and well placed in the evening sky.
• 6
  Messier 10 is well placed  Remind MeThe globular cluster M10 (NGC 6254; mag 6.6) in Ophiuchus culminates at around midnight local time.
• 7
  Messier 62 is well placed  Remind MeThe globular cluster M62 (NGC 6266; mag 6.4) in Ophiuchus culminates at around midnight local time.
• 8
  Moon at Last Quarter  Remind MeThe Moon reaches last quarter phase – rising in the east at around midnight and appearing high in the sky by sunrise.
• 9
  Conjunction of Venus and Jupiter  Remind MeVenus and Jupiter share the same right ascension, at a separation of 1°38'.
  Close approach of Venus and Jupiter  Remind MeVenus and Jupiter pass within 1°36' of each other.
  Mercury at dichotomy  Remind MeMercury reaches half phase in the evening sky.
• 10
  Close approach of the Moon and Saturn  Remind MeThe Moon and Saturn pass close to each other.
  Conjunction of the Moon and Saturn  Remind MeThe Moon and Saturn share the same right ascension, at a separation of 6°11'.
  Daytime Arietid meteor shower 2026  Remind MeThe Daytime Arietid meteor shower reaches its peak.
  Mercury at highest altitude in evening sky  Remind MeMercury is bright and well placed in the evening sky.
• 11
  Messier 92 is well placed  Remind MeThe globular cluster M92 (NGC 6341; mag 6.5) in Hercules culminates at around midnight local time.
• 12
  Conjunction of the Moon and Mars  Remind MeThe Moon and Mars share the same right ascension, at a separation of 5°38'.
• 13
  Close approach of the Moon and M45  Remind MeThe Moon and M45 pass close to each other.
• 14
  The Moon at perihelion  Remind MeThe Moon passes its closest point to the Sun, a monthly occurrence around the time of new moon.
  The Moon at perigee  Remind MeThe Moon makes its monthly closest approach to the Earth, appearing larger than at other times of the month – though only very fractionally.
  New Moon  Remind MeThe Moon disappears into the Sun's glare for a few days.
• 15
  Asteroid 14 Irene at opposition  Remind MeAsteroid 14 Irene makes closest approach to the Earth.
  Mercury at greatest elongation east  Remind MeMercury is bright and well placed in the evening sky.
• 16
  Conjunction of the Moon and Mercury  Remind MeThe Moon and Mercury share the same right ascension, at a separation of 2°35'.
  NGC 6388 is well placed  Remind MeThe globular cluster NGC 6388 (mag 6.8) in Scorpius culminates at around midnight local time.
  Conjunction of the Moon and Jupiter  Remind MeThe Moon and Jupiter share the same right ascension, at a separation of 2°32'.
  Close approach of the Moon and Jupiter  Remind MeThe Moon and Jupiter pass close to each other.
  Conjunction of the Moon and Venus  Remind MeThe Moon and Venus share the same right ascension, at a separation of 17'.
  Close approach of the Moon and Venus  Remind MeThe Moon and Venus pass close to each other.
  Lunar occultation of Venus  Remind MeThe Moon will pass in front of Venus, creating a lunar occultation visible from countries and territories including the Contiguous United States, Canada, Brazil and Venezuela amongst others.
  The Butterfly cluster is well placed  Remind MeThe Butterfly open star cluster (M6, NGC 6405; mag 4.2) in Scorpius culminates at around midnight local time.
  NGC 6397 is well placed  Remind MeThe globular cluster NGC 6397 (mag 5.6) in Ara culminates at around midnight local time.
  Close approach of the Moon and M44  Remind MeThe Moon and M44 pass close to each other.
• 18
  The cluster IC 4665 is well placed  Remind MeThe open star cluster IC 4665 (mag 4.2) in Ophiuchus culminates at around midnight local time.
• 19
  Lunar occultation of Regulus  Remind MeThe Moon will pass in front of Regulus (Alpha Leonis), creating a lunar occultation visible from countries and territories including South Africa, Mozambique, Madagascar and Zimbabwe amongst others.
  Close approach of Venus and M44  Remind MeVenus and M44 pass close to each other.
• 20
  The Ptolemy cluster is well placed  Remind MeThe Ptolemy Cluster (M7, NGC 6475; mag 3.3) in Scorpius culminates at around midnight local time.
• 21
  June solstice  Remind Me21 June will be the longest day of 2026 in the northern hemisphere.
  Moon at First Quarter  Remind MeThe Moon reaches first quarter phase – appearing high in the sky at sunset and remaining visible until around midnight.
• 23
  The Lagoon Nebula is well placed  Remind MeThe Lagoon Nebula (M8; mag 5.8) in Sagittarius culminates at around midnight local time.
• 24
  NGC 6541 is well placed  Remind MeThe globular cluster NGC 6541 (mag 6.6) in Corona Australis culminates at around midnight local time.
• 25
  Comet 78P/Gehrels passes perihelion  Remind MeComet 78P/Gehrels makes its closest approach to the Sun.
• 27
  Lunar occultation of Antares  Remind MeThe Moon will pass in front of Antares (Alpha Scorpii), creating a lunar occultation visible from countries and territories including Antarctica, Australia, New Zealand and Tasmania amongst others.
  June Bootid meteor shower 2026  Remind MeThe June Bootid meteor shower reaches its peak.
• 28
  The Moon at apogee  Remind MeThe Moon recedes to its orbit's furthest point from the Earth, making it appear fractionally smaller than at other times of the month.
• 29
  The cluster NGC 6633 is well placed  Remind MeThe open star cluster NGC 6633 (mag 4.6) in Ophiuchus culminates at around midnight local time.
  Full Moon  Remind MeThe Moon reaches full phase and is visible for much of the night.
  The Moon at aphelion  Remind MeThe Moon passes its furthest point from the Sun, a monthly occurrence around the time of full moon.
• 30
  Lunar occultation of Sigma Sagittarii  Remind MeThe Moon will pass in front of Sigma Sagittarii (Nunki), creating a lunar occultation visible from countries and territories including Argentina, Chile, Peru and New Zealand amongst others.