541.

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 (2,235 days ago) in Orion

542.

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 (2,235 days ago) in Taurus

543.

Venus at perihelion Venus passes its orbit's closest point to the Sun. Tue, 15 May 2018 at 19:15 EDT (2,237 days ago) in Taurus

544.

New Moon The Moon disappears into the Sun's glare for a few days. Tue, 15 May 2018 at 07:48 EDT (2,237 days ago) in Taurus

545.

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 (2,239 days ago) in Pisces

546.

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 (2,239 days ago) in Pisces

547.

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 (2,240 days ago) in Serpens Caput

548.

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 (2,240 days ago) in Aries

549.

Conjunction of Mercury and Eris Mercury and Eris share the same right ascension, at a separation of 9°46'. Fri, 11 May 2018 at 16:56 EDT (2,241 days ago) in Cetus

550.

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 (2,242 days ago) in Libra

551.

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 (2,244 days ago) in Libra

552.

η-Lyrid meteor shower 2018 The η-Lyrid meteor shower reaches its peak. Tue, 08 May 2018 (2,244 days ago) in Lyra

553.

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 (2,245 days ago) in Capricornus

554.

η-Aquariid meteor shower 2018 The η-Aquariid meteor shower reaches its peak. Sun, 06 May 2018 (2,246 days ago) in Aquarius

555.

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 (2,246 days ago) in Sagittarius

556.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Sun, 06 May 2018 at 02:49 EDT (2,246 days ago) in Sagittarius

557.

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 (2,247 days ago) in Sagittarius

558.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Fri, 04 May 2018 at 16:16 EDT (2,248 days ago) in Sagittarius

559.

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 (2,248 days ago) in Sagittarius

560.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Thu, 03 May 2018 at 12:44 EDT (2,249 days ago) in Pisces