1.

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 02:23 PDT (1,400 days ago) in Sagittarius

2.

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 19:33 PDT (1,399 days ago) in Capricornus

3.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Thu, 16 Sep 2021 at 20:57 PDT (1,399 days ago) in Capricornus

4.

Mercury at dichotomy Mercury reaches half phase in the evening sky. Fri, 17 Sep 2021 at 19:57 PDT (1,398 days ago) in Virgo

5.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 3°57'. Fri, 17 Sep 2021 at 23:54 PDT (1,398 days ago) in Capricornus

6.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Sat, 18 Sep 2021 at 02:07 PDT (1,397 days ago) in Capricornus

7.

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 09:44 PDT (1,397 days ago) in Aquarius

8.

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 04:33 PDT (1,395 days ago) in Virgo

9.

Full Moon The Moon reaches full phase and is visible for much of the night. Mon, 20 Sep 2021 at 16:54 PDT (1,395 days ago) in Pisces

10.

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 12:14 PDT (1,393 days ago) in Virgo

11.

Close approach of the Moon and Uranus The Moon and Uranus pass close to each other. Fri, 24 Sep 2021 at 10:08 PDT (1,391 days ago) in Aries

12.

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 (1,391 days ago) in Sculptor

13.

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 14:43 PDT (1,389 days ago) in Taurus

14.

Daytime Sextantid meteor shower 2021 The Daytime Sextantid meteor shower reaches its peak. Mon, 27 Sep 2021 (1,388 days ago) in Sextans

15.

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 (1,388 days ago) in Tucana

16.

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. Tue, 28 Sep 2021 at 18:57 PDT (1,387 days ago) in Gemini

17.

136472 Makemake at solar conjunction 136472 Makemake is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Wed, 29 Sep 2021 at 23:56 PDT (1,386 days ago) in Coma Berenices

18.

Asteroid 40 Harmonia at opposition Asteroid 40 Harmonia makes closest approach to the Earth. Fri, 01 Oct 2021 at 07:22 PDT (1,384 days ago) in Cetus

19.

The Andromeda Galaxy is well placed The Andromeda Galaxy M31 (mag 3.4) culminates at around midnight local time. Sat, 02 Oct 2021 (1,383 days ago) in Andromeda

20.

Venus at aphelion Venus passes the furthest point along its orbit from the Sun. Sat, 02 Oct 2021 at 21:07 PDT (1,383 days ago) in Libra