1.

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 02:12 PDT (1,397 days ago) in Aquarius

2.

Mercury at greatest elongation east Mercury is bright and well placed in the evening sky. Mon, 13 Sep 2021 at 14:55 PDT (1,398 days ago) in Virgo

3.

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 13:39 PDT (1,398 days ago) in Ophiuchus

4.

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 07:20 PDT (1,399 days ago) in Scorpius

5.

Asteroid 2 Pallas at opposition Asteroid 2 Pallas makes closest approach to the Earth. Sat, 11 Sep 2021 at 04:58 PDT (1,400 days ago) in Pisces

6.

The Moon at perigee The Moon makes its monthly closest approach to the Earth, making it appear fractionally larger than at other times of the month. Sat, 11 Sep 2021 at 03:03 PDT (1,400 days ago) in Libra

7.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Thu, 09 Sep 2021 at 22:17 PDT (1,402 days ago) in Virgo

8.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 4°04'. Thu, 09 Sep 2021 at 19:08 PDT (1,402 days ago) in Virgo

9.

September ε-Perseid meteor shower 2021 The September ε-Perseid meteor shower reaches its peak. Thu, 09 Sep 2021 (1,402 days ago) in Perseus

10.

The Moon at perihelion The Moon passes its orbit's closest point to the Sun, which happens each month around the time of new moon. Wed, 08 Sep 2021 at 17:17 PDT (1,403 days ago) in Virgo

11.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 6°31'. Wed, 08 Sep 2021 at 13:18 PDT (1,403 days ago) in Virgo

12.

Comet 4P/Faye passes perihelion Comet 4P/Faye makes its closest approach to the Sun. Wed, 08 Sep 2021 (1,403 days ago) in Taurus

13.

New Moon The Moon disappears into the Sun's glare for a few days. Mon, 06 Sep 2021 at 17:52 PDT (1,405 days ago) in Leo

14.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Sun, 05 Sep 2021 at 17:28 PDT (1,406 days ago) in Virgo

15.

Mercury at highest altitude in evening sky Mercury is bright and well placed in the evening sky. Sat, 04 Sep 2021 (1,407 days ago) in Virgo

16.

Aurigid meteor shower 2021 The Aurigid meteor shower reaches its peak. Tue, 31 Aug 2021 (1,410 days ago) in Auriga

17.

Comet 8P/Tuttle reaches peak brightness Comet 8P/Tuttle is forecast to reach the brightest point in its 2021 apparition. Tue, 31 Aug 2021 (1,411 days ago) in Hydra

18.

Moon at Last Quarter The Moon reaches last quarter phase – rising in the east at around midnight and appearing high in the sky by sunrise. Mon, 30 Aug 2021 at 00:13 PDT (1,412 days ago) in Taurus

19.

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, 29 Aug 2021 at 19:22 PDT (1,413 days ago) in Taurus

20.

Comet 8P/Tuttle passes perihelion Comet 8P/Tuttle makes its closest approach to the Sun. Fri, 27 Aug 2021 (1,415 days ago) in Hydra