1.

September ε-Perseid meteor shower 2020 The September ε-Perseid meteor shower reaches its peak. Tue, 08 Sep 2020 (1,767 days ago) in Perseus

2.

Mars enters retrograde motion Mars reverses its direction of motion across the sky. Wed, 09 Sep 2020 at 15:21 PDT (1,767 days ago) in Pisces

3.

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. Thu, 10 Sep 2020 at 02:26 PDT (1,766 days ago) in Taurus

4.

Asteroid 19 Fortuna at opposition Asteroid 19 Fortuna makes closest approach to the Earth. Thu, 10 Sep 2020 at 19:22 PDT (1,766 days ago) in Pisces

5.

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. Fri, 11 Sep 2020 at 13:17 PDT (1,765 days ago) in Aquarius

6.

Jupiter ends retrograde motion Jupiter returns to its usual eastward motion after opposition. Sat, 12 Sep 2020 at 17:47 PDT (1,764 days ago) in Sagittarius

7.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 4°27'. Sun, 13 Sep 2020 at 21:43 PDT (1,763 days ago) in Cancer

8.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Sun, 13 Sep 2020 at 23:22 PDT (1,763 days ago) in Cancer

9.

Comet 88P/Howell reaches peak brightness Comet 88P/Howell is forecast to reach the brightest point in its 2020 apparition. Mon, 14 Sep 2020 (1,762 days ago) in Scorpius

10.

Comet C/2020 K8 (Catalina-ATLAS) passes perihelion Comet C/2020 K8 (Catalina-ATLAS) makes its closest approach to the Sun. Mon, 14 Sep 2020 (1,762 days ago) in Sextans

11.

Supernova SN2020tlf discovered A new supernova has been discovered in NGC 5731. Tue, 15 Sep 2020 (1,760 days ago)

12.

New Moon The Moon disappears into the Sun's glare for a few days. Thu, 17 Sep 2020 at 04:01 PDT (1,759 days ago) in Virgo

13.

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. Fri, 18 Sep 2020 at 06:47 PDT (1,758 days ago) in Virgo

14.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 6°25'. Fri, 18 Sep 2020 at 14:52 PDT (1,758 days ago) in Virgo

15.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Fri, 18 Sep 2020 at 20:23 PDT (1,758 days ago) in Virgo

16.

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. Sat, 19 Sep 2020 at 06:06 PDT (1,757 days ago) in Virgo

17.

Conjunction of Mars and Eris Mars and Eris share the same right ascension, at a separation of 8°12'. Sun, 20 Sep 2020 at 18:41 PDT (1,756 days ago) in Cetus

18.

Lunar occultation of Beta1 Scorpii The Moon will pass in front of Beta1 Scorpii (Acrab), creating a lunar occultation visible from countries and territories including the Contiguous United States, Mexico, Nicaragua and Honduras amongst others. Mon, 21 Sep 2020 at 18:28 PDT (1,755 days ago) in Scorpius

19.

September equinox Day and night have equal length, marking the beginning of autumn in the northern hemisphere and spring in the southern hemisphere. Tue, 22 Sep 2020 at 06:23 PDT (1,754 days ago) in Virgo

20.

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. Wed, 23 Sep 2020 at 18:55 PDT (1,753 days ago) in Sagittarius