1.

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. Fri, 09 Apr 2021 at 01:32 PDT (1,551 days ago) in Aquarius

2.

New Moon The Moon disappears into the Sun's glare for a few days. Sun, 11 Apr 2021 at 19:32 PDT (1,549 days ago) in Pisces

3.

136199 Eris at solar conjunction 136199 Eris is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Tue, 13 Apr 2021 at 12:47 PDT (1,547 days ago) in Cetus

4.

Centaurus A is well placed Centaurus A (NGC 5128; mag 7.0) culminates at around midnight local time. Tue, 13 Apr 2021 (1,547 days ago) in Centaurus

5.

Omega Centauri is well placed The brightest globular cluster in the sky, Omega Centauri (mag 3.6) culminates at around midnight local time. Tue, 13 Apr 2021 (1,547 days ago) in Centaurus

6.

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. Wed, 14 Apr 2021 at 10:45 PDT (1,546 days ago) in Taurus

7.

The Whirlpool Galaxy is well placed The Whirlpool Galaxy M51 (NGC 5194; mag 8.4) in Canes Venatici culminates at around midnight local time. Wed, 14 Apr 2021 (1,546 days ago) in Canes Venatici

8.

Messier 83 is well placed The Southern Pinwheel Galaxy M83 (NGC 5236; mag 7.2), a face-on spiral galaxy in Hydra culminates at around midnight local time. Fri, 16 Apr 2021 (1,544 days ago) in Hydra

9.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 7'57". Sat, 17 Apr 2021 at 05:08 PDT (1,543 days ago) in Taurus

10.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Sat, 17 Apr 2021 at 05:10 PDT (1,543 days ago) in Taurus

11.

Lunar occultation of Mars The Moon will pass in front of Mars, creating a lunar occultation visible from Asia, Christmas Island, Spratly Islands and Paracel Islands. Sat, 17 Apr 2021 at 05:10 PDT (1,543 days ago) in Taurus

12.

136108 Haumea at opposition 136108 Haumea lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Sat, 17 Apr 2021 at 09:36 PDT (1,543 days ago) in Bootes

13.

Messier 3 is well placed The globular cluster M3 (NGC 5272; mag 6.3) in Canes Venatici culminates at around midnight local time. Sat, 17 Apr 2021 (1,543 days ago) in Canes Venatici

14.

Mercury at superior solar conjunction Mercury passes around the far side of the Sun. Sun, 18 Apr 2021 at 18:56 PDT (1,542 days ago) in Aries

15.

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, 19 Apr 2021 at 23:59 PDT (1,541 days ago) in Cancer

16.

Lyrid meteor shower 2021 The Lyrid meteor shower reaches its peak. Thu, 22 Apr 2021 (1,538 days ago) in Hercules

17.

Messier 101 is well placed The Pinwheel Galaxy M101 (NGC 5457; mag 7.9) in Ursa Major culminates at around midnight local time. Thu, 22 Apr 2021 (1,538 days ago) in Ursa Major

18.

π-Puppid meteor shower 2021 The π-Puppid meteor shower reaches its peak. Fri, 23 Apr 2021 (1,537 days ago) in Puppis

19.

Mercury at perihelion Mercury passes its orbit's closest point to the Sun. Mon, 26 Apr 2021 at 18:48 PDT (1,534 days ago) in Aries

20.

Full Moon The Moon reaches full phase and is visible for much of the night. Mon, 26 Apr 2021 at 20:31 PDT (1,534 days ago) in Libra