501.

Messier 2 is well placed The globular cluster M2 (NGC 7089; mag 6.6) in Aquarius culminates at around midnight local time. Tue, 15 Aug 2017 (2,528 days ago) in Aquarius

502.

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, 14 Aug 2017 at 21:15 EDT (2,529 days ago) in Taurus

503.

Messier 15 is well placed The globular cluster M15 (NGC 7078; mag 6.3) in Pegasus culminates at around midnight local time. Mon, 14 Aug 2017 (2,529 days ago) in Pegasus

504.

Supernova SN2017gax discovered A new supernova has been discovered in NGC 1672. Sun, 13 Aug 2017 (2,529 days ago)

505.

Perseid meteor shower 2017 The Perseid meteor shower reaches its peak. Sat, 12 Aug 2017 (2,531 days ago) in Perseus

506.

Conjunction of Venus and Ceres Venus and Ceres share the same right ascension, at a separation of 2°21'. Sat, 12 Aug 2017 at 01:51 EDT (2,531 days ago) in Gemini

507.

Lunar occultation of Neptune The Moon will pass in front of Neptune, creating a lunar occultation visible from Antarctica, French Southern Territories and Heard Island and McDonald Islands. Wed, 09 Aug 2017 at 19:05 EDT (2,534 days ago) in Aquarius

508.

Supernova SN2017fzw discovered A new supernova has been discovered in NGC 2217. Tue, 08 Aug 2017 (2,534 days ago)

509.

Partial lunar eclipse There will be an eclipse of the Moon, visible from Antarctica, Asia, Russia, Africa, Oceania and Europe. Mon, 07 Aug 2017 at 14:21 EDT (2,536 days ago) in Capricornus

510.

Full Moon The Moon reaches full phase and is visible for much of the night. Mon, 07 Aug 2017 at 14:10 EDT (2,536 days ago) in Capricornus

511.

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, 05 Aug 2017 at 23:30 EDT (2,538 days ago) in Sagittarius

512.

Mars at apogee Mars reaches its furthest point from the Earth, as it passes around the far side of the Sun. Sat, 05 Aug 2017 at 06:39 EDT (2,538 days ago) in Cancer

513.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Thu, 03 Aug 2017 at 03:53 EDT (2,540 days ago) in Ophiuchus

514.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 3°27'. Thu, 03 Aug 2017 at 03:09 EDT (2,540 days ago) in Ophiuchus

515.

Uranus enters retrograde motion Uranus reverses its direction of motion across the sky. Thu, 03 Aug 2017 at 01:08 EDT (2,540 days ago) in Pisces

516.

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. Wed, 02 Aug 2017 at 13:54 EDT (2,541 days ago) in Ophiuchus

517.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Wed, 02 Aug 2017 at 09:04 EDT (2,541 days ago) in Leo

518.

Venus at highest altitude in morning sky Venus is bright and well placed in the dawn sky. Wed, 02 Aug 2017 (2,541 days ago) in Pisces

519.

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. Sun, 30 Jul 2017 at 11:23 EDT (2,544 days ago) in Libra

520.

α-Capricornid meteor shower 2017 The α-Capricornid meteor shower reaches its peak. Sun, 30 Jul 2017 (2,544 days ago) in Capricornus