1.

Close approach of the Moon and M44 The Moon and M44 pass within 0°19' of each other. Fri, 10 May 2019 at 22:15 EDT (14 days ago) in Cancer

2.

Moon at First Quarter The Moon appears high in the sky at sunset and sets in the west at around midnight. Sat, 11 May 2019 at 21:14 EDT (13 days ago) in Leo

3.

Asteroid 8 Flora at opposition Asteroid 8 Flora is well placed for observation. Sun, 12 May 2019 at 00:48 EDT (12 days ago) in Libra

4.

M5 is well placed The globular cluster M5 (NGC 5904) in Serpens is well placed for observation. Sun, 12 May 2019 (12 days ago) in Serpens Caput

5.

α–Scorpiid meteor shower The α–Scorpiid meteor shower reaches its peak. Sun, 12 May 2019 (11 days ago) in Aries

6.

The Moon at perigee The Moon appears large as it makes its closest approach to the Earth. Mon, 13 May 2019 at 17:54 EDT (11 days ago) in Leo

7.

Asteroid 11 Parthenope at opposition Asteroid 11 Parthenope is well placed for observation. Tue, 14 May 2019 at 12:48 EDT (10 days ago) in Libra

8.

Conjunction of Venus and Uranus Venus and Uranus share the same right ascension, at a separation of 1°09'. Sat, 18 May 2019 at 04:08 EDT (6 days ago) in Aries

9.

Blue Moon The Moon is visible for much of the night. Sat, 18 May 2019 at 17:13 EDT (6 days ago) in Libra

10.

Asteroid 20 Massalia at opposition Asteroid 20 Massalia is well placed for observation. Mon, 20 May 2019 at 12:48 EDT (4 days ago) in Libra

11.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 1°41'. Mon, 20 May 2019 at 12:54 EDT (4 days ago) in Ophiuchus

12.

Close approach of the Moon and Jupiter The Moon and Jupiter pass within 1°40' of each other. Mon, 20 May 2019 at 13:20 EDT (4 days ago) in Ophiuchus

13.

The Moon at aphelion The Moon reaches its furthest point from the Sun. Mon, 20 May 2019 at 18:21 EDT (4 days ago) in Ophiuchus

14.

Mercury at superior solar conjunction Mercury passes around the far side of the Sun. Tue, 21 May 2019 at 08:55 EDT (3 days ago) in Taurus

15.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 0°31'. Wed, 22 May 2019 at 18:14 EDT (2 days ago) in Sagittarius

16.

Close approach of the Moon and Saturn The Moon and Saturn pass within 0°31' of each other. Wed, 22 May 2019 at 18:18 EDT (2 days ago) in Sagittarius

17.

Close approach of the Moon and Pluto The Moon and Pluto pass within 0°04' of each other. Wed, 22 May 2019 at 23:57 EDT (2 days ago) in Sagittarius

18.

Mercury at perihelion Mercury reaches its closest point to the Sun. Fri, 24 May 2019 at 03:18 EDT (5 hours ago) in Taurus

19.

The Moon at apogee The Moon appears small as it recedes to its furthest point from the Earth. Sun, 26 May 2019 at 09:28 EDT (2 days away) in Aquarius

20.

Moon at Last Quarter The Moon rises in the east at around midnight and appears high in the sky at sunrise. Sun, 26 May 2019 at 12:35 EDT (2 days away) in Aquarius