241.

June solstice 21 June will be the longest day of 2017 in the northern hemisphere. Tue, 20 Jun 2017 at 21:19 PDT (2,506 days ago) in Taurus

242.

Mercury at superior solar conjunction Mercury passes around the far side of the Sun. Wed, 21 Jun 2017 at 07:20 PDT (2,505 days ago) in Gemini

243.

Close approach of the Moon and Collinder 50 The Moon and Collinder 50 pass close to each other. Thu, 22 Jun 2017 at 04:08 PDT (2,504 days ago) in Taurus

244.

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 07:37 PDT (2,504 days ago) in Taurus

245.

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 (2,504 days ago) in Sagittarius

246.

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 03:51 PDT (2,503 days ago) in Taurus

247.

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 11:50 PDT (2,503 days ago) in Orion

248.

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 (2,503 days ago) in Corona Australis

249.

New Moon The Moon disappears into the Sun's glare for a few days. Fri, 23 Jun 2017 at 19:31 PDT (2,503 days ago) in Orion

250.

Comet 71P/Clark passes perihelion Comet 71P/Clark makes its closest approach to the Sun. Sun, 25 Jun 2017 (2,501 days ago) in Scorpius

251.

June Bootid meteor shower 2017 The June Bootid meteor shower reaches its peak. Tue, 27 Jun 2017 (2,499 days ago) in Bootes

252.

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 17:49 PDT (2,499 days ago) in Leo

253.

Asteroid 10 Hygiea at opposition Asteroid 10 Hygiea makes closest approach to the Earth. Wed, 28 Jun 2017 at 16:58 PDT (2,498 days ago) in Sagittarius

254.

The cluster NGC 6633 is well placed The open star cluster NGC 6633 (mag 4.6) in Ophiuchus culminates at around midnight local time. Wed, 28 Jun 2017 (2,498 days ago) in Ophiuchus

255.

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. Fri, 30 Jun 2017 at 17:51 PDT (2,496 days ago) in Virgo

256.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 2°42'. Sat, 01 Jul 2017 at 00:29 PDT (2,495 days ago) in Virgo

257.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Sat, 01 Jul 2017 at 02:13 PDT (2,495 days ago) in Virgo

258.

Messier 22 is well placed The globular cluster M22 (mag 5.2) in Sagittarius, near the Galactic centre, culminates at around midnight local time. Sat, 01 Jul 2017 (2,495 days ago) in Sagittarius

259.

The cluster IC 4756 is well placed The open star cluster IC 4756 (mag 4.6) in Serpens culminates at around midnight local time. Sat, 01 Jul 2017 (2,495 days ago) in Serpens Cauda

260.

Asteroid 3 Juno at opposition Asteroid 3 Juno makes closest approach to the Earth. Sun, 02 Jul 2017 at 12:10 PDT (2,494 days ago) in Scutum