401.

Asteroid 2 Pallas at opposition Asteroid 2 Pallas makes closest approach to the Earth. Sat, 11 Sep 2021 at 07:58 EDT (995 days ago) in Pisces

402.

Lunar occultation of Beta1 Scorpii The Moon will pass in front of Beta1 Scorpii (Acrab), creating a lunar occultation visible from Antarctica. Sun, 12 Sep 2021 at 10:20 EDT (994 days ago) in Scorpius

403.

Moon at First Quarter The Moon reaches first quarter phase – appearing high in the sky at sunset and setting in the west at around midnight. Mon, 13 Sep 2021 at 16:39 EDT (993 days ago) in Ophiuchus

404.

Mercury at greatest elongation east Mercury is bright and well placed in the evening sky. Mon, 13 Sep 2021 at 17:55 EDT (993 days ago) in Virgo

405.

Neptune at opposition Neptune lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Tue, 14 Sep 2021 at 05:12 EDT (992 days ago) in Aquarius

406.

Lunar occultation of Sigma Sagittarii The Moon will pass in front of Sigma Sagittarii (Nunki), creating a lunar occultation visible from countries and territories including Australia, Papua New Guinea, Indonesia and Solomon Islands amongst others. Wed, 15 Sep 2021 at 05:23 EDT (991 days ago) in Sagittarius

407.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 3°45'. Thu, 16 Sep 2021 at 22:33 EDT (990 days ago) in Capricornus

408.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Thu, 16 Sep 2021 at 23:57 EDT (990 days ago) in Capricornus

409.

Mercury at dichotomy Mercury reaches half phase in the evening sky. Fri, 17 Sep 2021 at 22:57 EDT (989 days ago) in Virgo

410.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 3°57'. Sat, 18 Sep 2021 at 02:54 EDT (988 days ago) in Capricornus

411.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Sat, 18 Sep 2021 at 05:07 EDT (988 days ago) in Capricornus

412.

The Moon at aphelion The Moon recedes to its orbit's furthest point from the Sun, which happens each month around the time of full moon. Sat, 18 Sep 2021 at 12:44 EDT (988 days ago) in Aquarius

413.

Mars at apogee Mars reaches its furthest point from the Earth, as it passes around the far side of the Sun. Mon, 20 Sep 2021 at 07:33 EDT (986 days ago) in Virgo

414.

Full Moon The Moon reaches full phase and is visible for much of the night. Mon, 20 Sep 2021 at 19:54 EDT (986 days ago) in Pisces

415.

September equinox Day and night have equal length, marking the beginning of autumn in the northern hemisphere and spring in the southern hemisphere. Wed, 22 Sep 2021 at 15:14 EDT (984 days ago) in Virgo

416.

Close approach of the Moon and Uranus The Moon and Uranus pass close to each other. Fri, 24 Sep 2021 at 13:08 EDT (982 days ago) in Aries

417.

NGC 55 is well placed NGC 55 (mag 8.2), a barred irregular galaxy in Sculptor culminates at around midnight local time. Fri, 24 Sep 2021 (982 days ago) in Sculptor

418.

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. Sun, 26 Sep 2021 at 17:43 EDT (980 days ago) in Taurus

419.

Daytime Sextantid meteor shower 2021 The Daytime Sextantid meteor shower reaches its peak. Mon, 27 Sep 2021 (979 days ago) in Sextans

420.

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. Mon, 27 Sep 2021 (979 days ago) in Tucana