501.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Sun, 05 Sep 2021 at 20:28 EDT (1,026 days ago) in Virgo

502.

New Moon The Moon disappears into the Sun's glare for a few days. Mon, 06 Sep 2021 at 20:52 EDT (1,025 days ago) in Leo

503.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 6°31'. Wed, 08 Sep 2021 at 16:18 EDT (1,023 days ago) in Virgo

504.

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, 08 Sep 2021 at 20:17 EDT (1,023 days ago) in Virgo

505.

September ε-Perseid meteor shower 2021 The September ε-Perseid meteor shower reaches its peak. Thu, 09 Sep 2021 (1,022 days ago) in Perseus

506.

Comet 4P/Faye passes perihelion Comet 4P/Faye makes its closest approach to the Sun. Thu, 09 Sep 2021 (1,022 days ago) in Taurus

507.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 4°04'. Thu, 09 Sep 2021 at 22:08 EDT (1,022 days ago) in Virgo

508.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Fri, 10 Sep 2021 at 01:17 EDT (1,021 days ago) in Virgo

509.

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. Sat, 11 Sep 2021 at 06:03 EDT (1,020 days ago) in Libra

510.

Asteroid 2 Pallas at opposition Asteroid 2 Pallas makes closest approach to the Earth. Sat, 11 Sep 2021 at 07:58 EDT (1,020 days ago) in Pisces

511.

Lunar occultation of Beta1 Scorpii The Moon will pass in front of Beta1 Scorpii (Acrab), creating a lunar occultation visible from Antarctica. Sun, 12 Sep 2021 at 10:20 EDT (1,019 days ago) in Scorpius

512.

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. Mon, 13 Sep 2021 at 16:39 EDT (1,018 days ago) in Ophiuchus

513.

Mercury at greatest elongation east Mercury is bright and well placed in the evening sky. Mon, 13 Sep 2021 at 17:55 EDT (1,018 days ago) in Virgo

514.

Neptune at opposition Neptune lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Tue, 14 Sep 2021 at 05:12 EDT (1,017 days ago) in Aquarius

515.

Lunar occultation of Sigma Sagittarii The Moon will pass in front of Sigma Sagittarii (Nunki), creating a lunar occultation visible from countries and territories including Australia, Papua New Guinea, Indonesia and Solomon Islands amongst others. Wed, 15 Sep 2021 at 05:23 EDT (1,016 days ago) in Sagittarius

516.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 3°45'. Thu, 16 Sep 2021 at 22:33 EDT (1,015 days ago) in Capricornus

517.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Thu, 16 Sep 2021 at 23:57 EDT (1,015 days ago) in Capricornus

518.

Mercury at dichotomy Mercury reaches half phase in the evening sky. Fri, 17 Sep 2021 at 22:57 EDT (1,014 days ago) in Virgo

519.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 3°57'. Sat, 18 Sep 2021 at 02:54 EDT (1,013 days ago) in Capricornus

520.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Sat, 18 Sep 2021 at 05:07 EDT (1,013 days ago) in Capricornus