1.

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. Wed, 11 Sep 2019 at 06:15 EDT (1,687 days ago) in Capricornus

2.

Comet 260P/McNaught passes perihelion Comet 260P/McNaught makes its closest approach to the Sun. Wed, 11 Sep 2019 (1,687 days ago) in Aries

3.

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. Fri, 13 Sep 2019 at 09:32 EDT (1,685 days ago) in Aquarius

4.

Full Moon The Moon reaches full phase and is visible for much of the night. Sat, 14 Sep 2019 at 00:32 EDT (1,684 days ago) in Aquarius

5.

Saturn ends retrograde motion Saturn returns to its usual eastward motion after opposition. Wed, 18 Sep 2019 at 04:25 EDT (1,680 days ago) in Sagittarius

6.

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. Sat, 21 Sep 2019 at 22:41 EDT (1,677 days ago) in Orion

7.

September equinox Day and night have equal length, marking the beginning of autumn in the northern hemisphere and spring in the southern hemisphere. Mon, 23 Sep 2019 at 03:43 EDT (1,675 days ago) in Virgo

8.

Close approach of the Moon and M44 The Moon and M44 pass close to each other. Tue, 24 Sep 2019 at 18:00 EDT (1,674 days ago) in Cancer

9.

NGC 55 is well placed NGC 55 (mag 8.2), a barred irregular galaxy in Sculptor culminates at around midnight local time. Wed, 25 Sep 2019 (1,673 days ago) in Sculptor

10.

Comet C/2018 W2 (Africano) reaches peak brightness Comet C/2018 W2 (Africano) is forecast to reach the brightest point in its 2019 apparition. Thu, 26 Sep 2019 (1,672 days ago) in Pegasus

11.

Comet C/2018 W2 (Africano) passes perigee Comet C/2018 W2 (Africano) makes its closest approach to the Earth. Fri, 27 Sep 2019 (1,671 days ago) in Pegasus

12.

Daytime Sextantid meteor shower 2019 The Daytime Sextantid meteor shower reaches its peak. Fri, 27 Sep 2019 (1,671 days ago) in Sextans

13.

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. Fri, 27 Sep 2019 (1,671 days ago) in Tucana

14.

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, 27 Sep 2019 at 22:23 EDT (1,671 days ago) in Virgo

15.

Asteroid 21 Lutetia at opposition Asteroid 21 Lutetia makes closest approach to the Earth. Sat, 28 Sep 2019 at 03:10 EDT (1,670 days ago) in Pisces

16.

New Moon The Moon disappears into the Sun's glare for a few days. Sat, 28 Sep 2019 at 14:27 EDT (1,670 days ago) in Virgo

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. Sat, 28 Sep 2019 at 22:14 EDT (1,670 days ago) in Coma Berenices

18.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 6°14'. Sun, 29 Sep 2019 at 18:01 EDT (1,669 days ago) in Virgo

19.

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. Tue, 01 Oct 2019 at 00:12 EDT (1,667 days ago) in Libra

20.

The Andromeda Galaxy is well placed The Andromeda Galaxy M31 (mag 3.4) culminates at around midnight local time. Wed, 02 Oct 2019 (1,666 days ago) in Andromeda