301.

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 (2,514 days ago) in Orion

302.

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 (2,514 days ago) in Taurus

303.

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 (2,515 days ago) in Sagittarius

304.

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 (2,515 days ago) in Taurus

305.

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 (2,515 days ago) in Taurus

306.

Mercury at superior solar conjunction Mercury passes around the far side of the Sun. Wed, 21 Jun 2017 at 10:20 EDT (2,516 days ago) in Gemini

307.

June solstice 21 June will be the longest day of 2017 in the northern hemisphere. Wed, 21 Jun 2017 at 00:19 EDT (2,516 days ago) in Taurus

308.

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 (2,517 days ago) in Scorpius

309.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Tue, 20 Jun 2017 at 18:20 EDT (2,517 days ago) in Aries

310.

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 (2,517 days ago) in Aries

311.

Mercury at perihelion Mercury passes its orbit's closest point to the Sun. Mon, 19 Jun 2017 at 09:42 EDT (2,518 days ago) in Taurus

312.

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 (2,519 days ago) in Ophiuchus

313.

Asteroid 6 Hebe at opposition Asteroid 6 Hebe makes closest approach to the Earth. Sun, 18 Jun 2017 at 00:46 EDT (2,519 days ago) in Ophiuchus

314.

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 (2,520 days ago) in Ara

315.

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 (2,520 days ago) in Aquarius

316.

The Butterfly cluster is well placed The Butterfly open star cluster (M6, NGC 6405; mag 4.2) in Scorpius culminates at around midnight local time. Fri, 16 Jun 2017 (2,521 days ago) in Scorpius

317.

Lunar occultation of Neptune The Moon will pass in front of Neptune, creating a lunar occultation visible from Antarctica. Fri, 16 Jun 2017 at 09:03 EDT (2,521 days ago) in Aquarius

318.

Neptune enters retrograde motion Neptune reverses its direction of motion across the sky. Fri, 16 Jun 2017 at 07:41 EDT (2,521 days ago) in Aquarius

319.

NGC 6388 is well placed The globular cluster NGC 6388 (mag 6.8) in Scorpius culminates at around midnight local time. Thu, 15 Jun 2017 (2,522 days ago) in Scorpius

320.

Saturn at opposition Saturn lies in the opposite direction to the Sun in the sky, making it slightly closer, brighter and larger than at other times. It is also optimally positioned to be observable for much of the night. Thu, 15 Jun 2017 at 06:09 EDT (2,522 days ago) in Ophiuchus