321.

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, 06 Sep 2020 at 02:28 EDT (1,341 days ago) in Pisces

322.

September ε-Perseid meteor shower 2020 The September ε-Perseid meteor shower reaches its peak. Wed, 09 Sep 2020 (1,338 days ago) in Perseus

323.

Mars enters retrograde motion Mars reverses its direction of motion across the sky. Wed, 09 Sep 2020 at 18:21 EDT (1,338 days ago) in Pisces

324.

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 05:26 EDT (1,337 days ago) in Taurus

325.

Asteroid 19 Fortuna at opposition Asteroid 19 Fortuna makes closest approach to the Earth. Thu, 10 Sep 2020 at 15:10 EDT (1,337 days ago) in Pisces

326.

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 16:17 EDT (1,336 days ago) in Aquarius

327.

Jupiter ends retrograde motion Jupiter returns to its usual eastward motion after opposition. Sat, 12 Sep 2020 at 20:47 EDT (1,335 days ago) in Sagittarius

328.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 4°27'. Mon, 14 Sep 2020 at 00:43 EDT (1,333 days ago) in Cancer

329.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Mon, 14 Sep 2020 at 02:22 EDT (1,333 days ago) in Cancer

330.

Comet C/2020 K8 (Catalina-ATLAS) passes perihelion Comet C/2020 K8 (Catalina-ATLAS) makes its closest approach to the Sun. Tue, 15 Sep 2020 (1,332 days ago) in Sextans

331.

Supernova SN2020tlf discovered A new supernova has been discovered in NGC 5731. Tue, 15 Sep 2020 (1,331 days ago)

332.

Comet 88P/Howell reaches peak brightness Comet 88P/Howell is forecast to reach the brightest point in its 2020 apparition. Wed, 16 Sep 2020 (1,331 days ago) in Scorpius

333.

New Moon The Moon disappears into the Sun's glare for a few days. Thu, 17 Sep 2020 at 07:01 EDT (1,330 days ago) in Virgo

334.

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 09:47 EDT (1,329 days ago) in Virgo

335.

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 17:52 EDT (1,329 days ago) in Virgo

336.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Fri, 18 Sep 2020 at 23:23 EDT (1,329 days ago) in Virgo

337.

Conjunction of Mars and Eris Mars and Eris share the same right ascension, at a separation of 8°09'. Sat, 19 Sep 2020 at 01:02 EDT (1,328 days ago) in Cetus

338.

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 09:06 EDT (1,328 days ago) in Virgo

339.

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 21:28 EDT (1,326 days ago) in Scorpius

340.

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 09:23 EDT (1,325 days ago) in Virgo