301.

New Moon The Moon disappears into the Sun's glare for a few days. Tue, 11 May 2021 at 15:01 EDT (1,093 days ago) in Aries

302.

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. Tue, 11 May 2021 at 17:53 EDT (1,093 days ago) in Aries

303.

Messier 5 is well placed The globular cluster M5 (NGC 5904; mag 5.7) in Serpens culminates at around midnight local time. Tue, 11 May 2021 (1,093 days ago) in Serpens Caput

304.

Mercury at dichotomy Mercury reaches half phase in the evening sky. Wed, 12 May 2021 at 01:20 EDT (1,092 days ago) in Taurus

305.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 42'. Wed, 12 May 2021 at 18:03 EDT (1,092 days ago) in Taurus

306.

Lunar occultation of Venus The Moon will pass in front of Venus, creating a lunar occultation visible from New Zealand, French Polynesia and Pitcairn. Wed, 12 May 2021 at 18:30 EDT (1,092 days ago) in Taurus

307.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 2°08'. Thu, 13 May 2021 at 13:58 EDT (1,091 days ago) in Taurus

308.

Mercury at highest altitude in evening sky Mercury is bright and well placed in the evening sky. Sat, 15 May 2021 (1,089 days ago) in Taurus

309.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 1°28'. Sun, 16 May 2021 at 00:47 EDT (1,088 days ago) in Gemini

310.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Sun, 16 May 2021 at 00:51 EDT (1,088 days ago) in Gemini

311.

Mercury at greatest elongation east Mercury is bright and well placed in the evening sky. Mon, 17 May 2021 at 04:14 EDT (1,087 days ago) in Taurus

312.

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. Wed, 19 May 2021 at 15:13 EDT (1,085 days ago) in Leo

313.

Saturn enters retrograde motion Saturn reverses its direction of motion across the sky. Sun, 23 May 2021 at 05:36 EDT (1,081 days ago) in Capricornus

314.

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. Tue, 25 May 2021 at 21:49 EDT (1,079 days ago) in Libra

315.

Lunar occultation of Beta1 Scorpii The Moon will pass in front of Beta1 Scorpii (Acrab), creating a lunar occultation visible from countries and territories including Argentina, Chile, Uruguay and Brazil amongst others. Wed, 26 May 2021 at 04:05 EDT (1,078 days ago) in Scorpius

316.

Full Moon The Moon reaches full phase and is visible for much of the night. Wed, 26 May 2021 at 07:13 EDT (1,078 days ago) in Scorpius

317.

Total lunar eclipse There will be an eclipse of the Moon, visible from Antarctica, the Americas, Oceania, Eastern and Southeast Asia, south-eastern Russia and Alaska. Wed, 26 May 2021 at 07:18 EDT (1,078 days ago) in Scorpius

318.

The Moon at aphelion The Moon recedes to its orbit's furthest point from the Sun, which happens each month around the time of full moon. Thu, 27 May 2021 at 15:46 EDT (1,077 days ago) in Ophiuchus

319.

Lunar occultation of Sigma Sagittarii The Moon will pass in front of Sigma Sagittarii (Nunki), creating a lunar occultation visible from Africa, Asia, Southern and Eastern Europe, Corsica and RAF Akrotiri. Fri, 28 May 2021 at 19:07 EDT (1,076 days ago) in Sagittarius

320.

Messier 4 is well placed The globular cluster M4 (NGC 6121; mag 5.4) in Scorpius culminates at around midnight local time. Fri, 28 May 2021 (1,076 days ago) in Scorpius