521.

Messier 4 is well placed The globular cluster M4 (NGC 6121; mag 5.4) in Scorpius culminates at around midnight local time. Sun, 28 May 2023 (399 days ago) in Scorpius

522.

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 (400 days ago) in Leo

523.

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 (402 days ago) in Leo

524.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Wed, 24 May 2023 at 15:19 EDT (403 days ago) in Cancer

525.

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 (403 days ago) in Cancer

526.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Tue, 23 May 2023 at 08:37 EDT (404 days ago) in Gemini

527.

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 (404 days ago) in Gemini

528.

New Moon The Moon disappears into the Sun's glare for a few days. Fri, 19 May 2023 at 11:54 EDT (408 days ago) in Taurus

529.

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 (410 days ago) in Aries

530.

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 (410 days ago) in Aries

531.

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 (410 days ago) in Pisces

532.

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 (410 days ago) in Pisces

533.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Wed, 17 May 2023 at 08:40 EDT (410 days ago) in Pisces

534.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Sun, 14 May 2023 at 15:27 EDT (413 days ago) in Aries

535.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Sat, 13 May 2023 at 11:26 EDT (414 days ago) in Aquarius

536.

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 (414 days ago) in Aquarius

537.

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 (415 days ago) in Serpens Caput

538.

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 (415 days ago) in Capricornus

539.

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 (416 days ago) in Capricornus

540.

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 (418 days ago) in Aries