521.

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. Sat, 09 May 2020 at 07:48 EDT (1,507 days ago) in Ophiuchus

522.

Mercury at perihelion Mercury passes its orbit's closest point to the Sun. Sun, 10 May 2020 at 00:48 EDT (1,506 days ago) in Taurus

523.

Saturn enters retrograde motion Saturn reverses its direction of motion across the sky. Sun, 10 May 2020 at 23:38 EDT (1,506 days ago) in Capricornus

524.

Messier 5 is well placed The globular cluster M5 (NGC 5904; mag 5.7) in Serpens culminates at around midnight local time. Mon, 11 May 2020 (1,505 days ago) in Serpens Caput

525.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 2°15'. Tue, 12 May 2020 at 05:40 EDT (1,504 days ago) in Sagittarius

526.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Tue, 12 May 2020 at 06:09 EDT (1,504 days ago) in Sagittarius

527.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 2°40'. Tue, 12 May 2020 at 14:10 EDT (1,504 days ago) in Capricornus

528.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Tue, 12 May 2020 at 14:54 EDT (1,504 days ago) in Capricornus

529.

Comet C/2017 T2 (PANSTARRS) reaches peak brightness Comet C/2017 T2 (PANSTARRS) is forecast to reach the brightest point in its 2020 apparition. Thu, 14 May 2020 (1,502 days ago) in Camelopardalis

530.

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. Thu, 14 May 2020 at 10:03 EDT (1,502 days ago) in Capricornus

531.

Jupiter enters retrograde motion Jupiter reverses its direction of motion across the sky. Thu, 14 May 2020 at 10:33 EDT (1,502 days ago) in Sagittarius

532.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 2°45'. Thu, 14 May 2020 at 22:01 EDT (1,502 days ago) in Aquarius

533.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Thu, 14 May 2020 at 23:51 EDT (1,502 days ago) in Aquarius

534.

Close approach of Jupiter and Saturn Jupiter and Saturn pass within 4°41' of each other. Mon, 18 May 2020 at 00:42 EDT (1,498 days ago) in Capricornus

535.

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. Mon, 18 May 2020 at 03:44 EDT (1,498 days ago) in Cetus

536.

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, 20 May 2020 at 10:46 EDT (1,496 days ago) in Cetus

537.

Conjunction of Venus and Mercury Venus and Mercury share the same right ascension, at a separation of 53'. Fri, 22 May 2020 at 03:52 EDT (1,494 days ago) in Taurus

538.

New Moon The Moon disappears into the Sun's glare for a few days. Fri, 22 May 2020 at 13:40 EDT (1,494 days ago) in Taurus

539.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 3°41'. Sat, 23 May 2020 at 22:41 EDT (1,493 days ago) in Taurus

540.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 2°46'. Sun, 24 May 2020 at 06:51 EDT (1,492 days ago) in Taurus