641.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Mon, 14 Sep 2026 at 07:34 EST (239 days away) in Virgo

642.

Lunar occultation of Venus The Moon will pass in front of Venus, creating a lunar occultation visible from parts of Africa, Asia, Europe, Russia, British Indian Ocean Territory, Corsica, Menorca, Mallorca, Ibiza, Isla de Alborán, Melilla, Islas Chafarinas and RAF Akrotiri. Mon, 14 Sep 2026 at 07:34 EST (239 days away) in Virgo

643.

Lunar occultation of Antares The Moon will pass in front of Antares (Alpha Scorpii), creating a lunar occultation visible from countries and territories including Antarctica, Australia, Tasmania and Heard Island and McDonald Islands amongst others. Thu, 17 Sep 2026 at 08:53 EST (242 days away) in Scorpius

644.

Moon at First Quarter The Moon reaches first quarter phase – appearing high in the sky at sunset and remaining visible until around midnight. Fri, 18 Sep 2026 at 16:44 EST (243 days away) in Ophiuchus

645.

The Moon at apogee The Moon recedes to its orbit's furthest point from the Earth, making it appear fractionally smaller than at other times of the month. Fri, 18 Sep 2026 at 23:00 EST (243 days away) in Sagittarius

646.

Lunar occultation of Sigma Sagittarii The Moon will pass in front of Sigma Sagittarii (Nunki), creating a lunar occultation visible from French Polynesia, New Zealand and Pitcairn. Sun, 20 Sep 2026 at 02:45 EST (245 days away) in Sagittarius

647.

Venus at greatest brightness Venus reaches its greatest brightness in the evening sky. Tue, 22 Sep 2026 at 13:32 EST (247 days away) in Virgo

648.

September equinox Day and night have equal length: the beginning of astronomical autumn in the northern hemisphere. Tue, 22 Sep 2026 at 20:08 EST (247 days away) in Virgo

649.

The Moon at aphelion The Moon passes its furthest point from the Sun, a monthly occurrence around the time of full moon. Wed, 23 Sep 2026 at 14:53 EST (248 days away) in Capricornus

650.

NGC 55 is well placed NGC 55 (mag 8.2), a barred irregular galaxy in Sculptor culminates at around midnight local time. Fri, 25 Sep 2026 (250 days away) in Sculptor

651.

Neptune at opposition Neptune is optimally positioned for observation. Fri, 25 Sep 2026 at 21:28 EST (250 days away) in Pisces

652.

Full Moon The Moon reaches full phase and is visible for much of the night. Sat, 26 Sep 2026 at 12:48 EST (251 days away) in Pisces

653.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Sun, 27 Sep 2026 at 02:35 EST (252 days away) in Cetus

654.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Sun, 27 Sep 2026 at 04:57 EST (252 days away) in Virgo

655.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 6°55'. Sun, 27 Sep 2026 at 08:00 EST (252 days away) in Cetus

656.

Daytime Sextantid meteor shower 2026 The Daytime Sextantid meteor shower reaches its peak. Sun, 27 Sep 2026 (252 days away) in Sextans

657.

47 Tuc is well placed The second brightest globular cluster in the sky, 47 Tuc (NGC 104; mag 4.0), in Tucana culminates at around midnight local time. Sun, 27 Sep 2026 (252 days away) in Tucana

658.

Asteroid 192 Nausikaa at opposition Asteroid 192 Nausikaa makes closest approach to the Earth. Wed, 30 Sep 2026 at 07:58 EST (255 days away) in Pisces

659.

Close approach of the Moon and M45 The Moon and M45 pass close to each other. Wed, 30 Sep 2026 at 14:03 EST (255 days away) in Taurus

660.

The Moon at perigee The Moon makes its monthly closest approach to the Earth, appearing larger than at other times of the month – though only very fractionally. Thu, 01 Oct 2026 at 16:51 EST (256 days away) in Taurus