501.

June solstice 21 June will be the longest day of 2021 in the northern hemisphere. Sun, 20 Jun 2021 at 23:25 EDT (1,104 days ago) in Taurus

502.

Lunar occultation of Beta1 Scorpii The Moon will pass in front of Beta1 Scorpii (Acrab), creating a lunar occultation visible from Sub-Saharan Africa, Australia and Heard Island and McDonald Islands. Tue, 22 Jun 2021 at 14:28 EDT (1,102 days ago) in Scorpius

503.

The Lagoon Nebula is well placed The Lagoon Nebula (M8; mag 5.8) in Sagittarius culminates at around midnight local time. Tue, 22 Jun 2021 (1,102 days ago) in Sagittarius

504.

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. Wed, 23 Jun 2021 at 05:54 EDT (1,101 days ago) in Ophiuchus

505.

Close approach of Mars and M44 Mars and M44 pass close to each other. Wed, 23 Jun 2021 at 18:35 EDT (1,101 days ago) in Cancer

506.

NGC 6541 is well placed The globular cluster NGC 6541 (mag 6.6) in Corona Australis culminates at around midnight local time. Wed, 23 Jun 2021 (1,101 days ago) in Corona Australis

507.

Full Moon The Moon reaches full phase and is visible for much of the night. Thu, 24 Jun 2021 at 14:39 EDT (1,100 days ago) in Sagittarius

508.

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. Fri, 25 Jun 2021 at 01:47 EDT (1,099 days ago) in Sagittarius

509.

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 the Contiguous United States, Mexico, Hawaii and Kiribati amongst others. Fri, 25 Jun 2021 at 05:40 EDT (1,099 days ago) in Sagittarius

510.

Neptune enters retrograde motion Neptune reverses its direction of motion across the sky. Fri, 25 Jun 2021 at 13:08 EDT (1,099 days ago) in Aquarius

511.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 4°01'. Sun, 27 Jun 2021 at 05:26 EDT (1,097 days ago) in Capricornus

512.

June Bootid meteor shower 2021 The June Bootid meteor shower reaches its peak. Sun, 27 Jun 2021 (1,097 days ago) in Bootes

513.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Sun, 27 Jun 2021 at 07:05 EDT (1,097 days ago) in Capricornus

514.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 4°27'. Mon, 28 Jun 2021 at 14:41 EDT (1,096 days ago) in Aquarius

515.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Mon, 28 Jun 2021 at 17:27 EDT (1,096 days ago) in Aquarius

516.

The cluster NGC 6633 is well placed The open star cluster NGC 6633 (mag 4.6) in Ophiuchus culminates at around midnight local time. Mon, 28 Jun 2021 (1,096 days ago) in Ophiuchus

517.

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, 01 Jul 2021 at 17:11 EDT (1,093 days ago) in Cetus

518.

Messier 22 is well placed The globular cluster M22 (mag 5.2) in Sagittarius, near the Galactic centre, culminates at around midnight local time. Thu, 01 Jul 2021 (1,093 days ago) in Sagittarius

519.

The cluster IC 4756 is well placed The open star cluster IC 4756 (mag 4.6) in Serpens culminates at around midnight local time. Thu, 01 Jul 2021 (1,093 days ago) in Serpens Cauda

520.

Close approach of Venus and M44 Venus and M44 pass close to each other. Sat, 03 Jul 2021 at 07:41 EDT (1,091 days ago) in Cancer