301.

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. Thu, 17 May 2018 at 17:04 EDT (2,164 days ago) in Orion

302.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 4°49'. Thu, 17 May 2018 at 14:08 EDT (2,164 days ago) in Taurus

303.

Venus at perihelion Venus passes its orbit's closest point to the Sun. Tue, 15 May 2018 at 19:15 EDT (2,166 days ago) in Taurus

304.

New Moon The Moon disappears into the Sun's glare for a few days. Tue, 15 May 2018 at 07:48 EDT (2,166 days ago) in Taurus

305.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 2°23'. Sun, 13 May 2018 at 13:19 EDT (2,168 days ago) in Pisces

306.

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. Sun, 13 May 2018 at 06:25 EDT (2,168 days ago) in Pisces

307.

Messier 5 is well placed The globular cluster M5 (NGC 5904; mag 5.7) in Serpens culminates at around midnight local time. Sat, 12 May 2018 (2,169 days ago) in Serpens Caput

308.

Conjunction of Mercury and Uranus Mercury and Uranus share the same right ascension, at a separation of 2°24'. Sat, 12 May 2018 at 17:00 EDT (2,169 days ago) in Aries

309.

Conjunction of Mercury and Eris Mercury and Eris share the same right ascension, at a separation of 9°46'. Fri, 11 May 2018 at 16:55 EDT (2,170 days ago) in Cetus

310.

Jupiter at perigee Jupiter reaches its closest point to the Earth – marking the best time to observe it in 1970. Thu, 10 May 2018 at 07:53 EDT (2,171 days ago) in Libra

311.

Jupiter at opposition Jupiter 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. Tue, 08 May 2018 at 20:31 EDT (2,173 days ago) in Libra

312.

η-Lyrid meteor shower 2018 The η-Lyrid meteor shower reaches its peak. Tue, 08 May 2018 (2,173 days ago) in Lyra

313.

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. Mon, 07 May 2018 at 22:09 EDT (2,174 days ago) in Capricornus

314.

η-Aquariid meteor shower 2018 The η-Aquariid meteor shower reaches its peak. Sun, 06 May 2018 (2,175 days ago) in Aquarius

315.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 2°44'. Sun, 06 May 2018 at 03:24 EDT (2,175 days ago) in Sagittarius

316.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Sun, 06 May 2018 at 02:49 EDT (2,175 days ago) in Sagittarius

317.

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. Sat, 05 May 2018 at 20:34 EDT (2,176 days ago) in Sagittarius

318.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Fri, 04 May 2018 at 16:16 EDT (2,177 days ago) in Sagittarius

319.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 1°41'. Fri, 04 May 2018 at 16:14 EDT (2,177 days ago) in Sagittarius

320.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Thu, 03 May 2018 at 12:44 EDT (2,178 days ago) in Pisces