301.

η-Lyrid meteor shower 2023 The η-Lyrid meteor shower reaches its peak. Tue, 09 May 2023 (464 days ago) in Lyra

302.

Uranus at solar conjunction Uranus is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Tue, 09 May 2023 at 15:46 EDT (464 days ago) in Aries

303.

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, 11 May 2023 at 01:05 EDT (462 days ago) in Capricornus

304.

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. Fri, 12 May 2023 at 10:28 EDT (461 days ago) in Capricornus

305.

Messier 5 is well placed The globular cluster M5 (NGC 5904; mag 5.7) in Serpens culminates at around midnight local time. Fri, 12 May 2023 (461 days ago) in Serpens Caput

306.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 3°17'. Sat, 13 May 2023 at 09:07 EDT (460 days ago) in Aquarius

307.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Sat, 13 May 2023 at 11:26 EDT (460 days ago) in Aquarius

308.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Sun, 14 May 2023 at 15:27 EDT (459 days ago) in Aries

309.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Wed, 17 May 2023 at 08:40 EDT (456 days ago) in Pisces

310.

Lunar occultation of Jupiter The Moon will pass in front of Jupiter, creating a lunar occultation visible from countries and territories including Canada, the Contiguous United States, Greenland and Mexico amongst others. Wed, 17 May 2023 at 08:40 EDT (456 days ago) in Pisces

311.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 47'. Wed, 17 May 2023 at 09:18 EDT (456 days ago) in Pisces

312.

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. Wed, 17 May 2023 at 20:22 EDT (456 days ago) in Aries

313.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 3°35'. Wed, 17 May 2023 at 21:36 EDT (456 days ago) in Aries

314.

New Moon The Moon disappears into the Sun's glare for a few days. Fri, 19 May 2023 at 11:54 EDT (454 days ago) in Taurus

315.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 2°12'. Tue, 23 May 2023 at 08:09 EDT (450 days ago) in Gemini

316.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Tue, 23 May 2023 at 08:37 EDT (450 days ago) in Gemini

317.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 3°45'. Wed, 24 May 2023 at 13:33 EDT (449 days ago) in Cancer

318.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Wed, 24 May 2023 at 15:19 EDT (449 days ago) in Cancer

319.

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. Thu, 25 May 2023 at 21:38 EDT (448 days ago) in Leo

320.

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. Sat, 27 May 2023 at 11:22 EDT (446 days ago) in Leo