1.

Lunar occultation of Regulus The Moon will pass in front of Regulus (Alpha Leonis), creating a lunar occultation visible from Peru and Ecuador. Tue, 27 Jun 2017 at 20:49 EDT (2,520 days ago) in Leo

2.

June Bootid meteor shower 2017 The June Bootid meteor shower reaches its peak. Tue, 27 Jun 2017 (2,520 days ago) in Bootes

3.

Comet 71P/Clark passes perihelion Comet 71P/Clark makes its closest approach to the Sun. Sun, 25 Jun 2017 (2,522 days ago) in Scorpius

4.

New Moon The Moon disappears into the Sun's glare for a few days. Fri, 23 Jun 2017 at 22:31 EDT (2,524 days ago) in Orion

5.

NGC 6541 is well placed The globular cluster NGC 6541 (mag 6.6) in Corona Australis culminates at around midnight local time. Fri, 23 Jun 2017 (2,524 days ago) in Corona Australis

6.

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, 23 Jun 2017 at 14:50 EDT (2,524 days ago) in Orion

7.

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, 23 Jun 2017 at 06:51 EDT (2,524 days ago) in Taurus

8.

The Lagoon Nebula is well placed The Lagoon Nebula (M8; mag 5.8) in Sagittarius culminates at around midnight local time. Thu, 22 Jun 2017 (2,525 days ago) in Sagittarius

9.

Lunar occultation of Aldebaran The Moon will pass in front of Aldebaran (Alpha Tauri), creating a lunar occultation visible from Mexico. Thu, 22 Jun 2017 at 10:37 EDT (2,525 days ago) in Taurus

10.

Close approach of the Moon and Collinder 50 The Moon and Collinder 50 pass close to each other. Thu, 22 Jun 2017 at 07:08 EDT (2,525 days ago) in Taurus

11.

Mercury at superior solar conjunction Mercury passes around the far side of the Sun. Wed, 21 Jun 2017 at 10:20 EDT (2,526 days ago) in Gemini

12.

June solstice 21 June will be the longest day of 2017 in the northern hemisphere. Wed, 21 Jun 2017 at 00:19 EDT (2,526 days ago) in Taurus

13.

The Ptolemy cluster is well placed The Ptolemy Cluster (M7, NGC 6475; mag 3.3) in Scorpius culminates at around midnight local time. Tue, 20 Jun 2017 (2,527 days ago) in Scorpius

14.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Tue, 20 Jun 2017 at 18:20 EDT (2,527 days ago) in Aries

15.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 2°22'. Tue, 20 Jun 2017 at 17:11 EDT (2,527 days ago) in Aries

16.

Mercury at perihelion Mercury passes its orbit's closest point to the Sun. Mon, 19 Jun 2017 at 09:42 EDT (2,528 days ago) in Taurus

17.

The cluster IC 4665 is well placed The open star cluster IC 4665 (mag 4.2) in Ophiuchus culminates at around midnight local time. Sun, 18 Jun 2017 (2,529 days ago) in Ophiuchus

18.

Asteroid 6 Hebe at opposition Asteroid 6 Hebe makes closest approach to the Earth. Sun, 18 Jun 2017 at 00:46 EDT (2,529 days ago) in Ophiuchus

19.

NGC 6397 is well placed The globular cluster NGC 6397 (mag 5.6) in Ara culminates at around midnight local time. Sat, 17 Jun 2017 (2,530 days ago) in Ara

20.

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, 17 Jun 2017 at 07:33 EDT (2,530 days ago) in Aquarius