621.

Quadrantid meteor shower 2023 The Quadrantid meteor shower reaches its peak. Tue, 03 Jan 2023 (543 days ago) in Bootes

622.

The Earth at perihelion The Earth reaches its closest point to the Sun. Wed, 04 Jan 2023 at 11:17 EDT (543 days ago) in Pisces

623.

Full Moon The Moon reaches full phase and is visible for much of the night. Fri, 06 Jan 2023 at 18:07 EDT (541 days ago) in Gemini

624.

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, 06 Jan 2023 at 22:55 EDT (541 days ago) in Gemini

625.

Mercury at inferior solar conjunction Mercury passes around the near side of the Sun. Sat, 07 Jan 2023 at 07:53 EDT (540 days ago) in Sagittarius

626.

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. Sun, 08 Jan 2023 at 04:19 EDT (539 days ago) in Cancer

627.

Comet C/2022 E3 (ZTF) passes perihelion Comet C/2022 E3 (ZTF) makes its closest approach to the Sun. Thu, 12 Jan 2023 (535 days ago)

628.

Mars ends retrograde motion Mars returns to its usual eastward motion after opposition. Thu, 12 Jan 2023 at 15:54 EDT (535 days ago) in Taurus

629.

Comet C/2022 U2 (ATLAS) passes perihelion Comet C/2022 U2 (ATLAS) makes its closest approach to the Sun. Sat, 14 Jan 2023 (533 days ago) in Cassiopeia

630.

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. Sat, 14 Jan 2023 at 21:10 EDT (533 days ago) in Virgo

631.

The cluster Messier 47 is well placed The open star cluster M47 (NGC 2422; mag 4.4) in Puppis culminates at around midnight local time. Sun, 15 Jan 2023 (532 days ago) in Puppis

632.

NGC 2403 is well placed NGC 2403 (mag 8.9), a spiral galaxy in Camelopardalis culminates at around midnight local time. Sun, 15 Jan 2023 (532 days ago) in Camelopardalis

633.

Asteroid 2 Pallas at opposition Asteroid 2 Pallas makes closest approach to the Earth. Sun, 15 Jan 2023 at 23:46 EDT (531 days ago) in Canis Major

634.

Lunar occultation of Delta Scorpii The Moon will pass in front of Delta Scorpii (Dschubba), creating a lunar occultation visible from Asia, Christmas Island, Spratly Islands and Paracel Islands. Tue, 17 Jan 2023 at 17:29 EDT (530 days ago) in Scorpius

635.

The cluster NGC 2451 is well placed The open star cluster NGC 2451 (mag 2.8) in Puppis culminates at around midnight local time. Tue, 17 Jan 2023 (530 days ago) in Puppis

636.

134340 Pluto at solar conjunction 134340 Pluto is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Wed, 18 Jan 2023 at 17:34 EDT (529 days ago) in Sagittarius

637.

γ-Ursae Minorid meteor shower 2023 The γ-Ursae Minorid meteor shower reaches its peak. Thu, 19 Jan 2023 (528 days ago) in Ursa Minor

638.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 6°56'. Fri, 20 Jan 2023 at 02:51 EDT (527 days ago) in Sagittarius

639.

The cluster NGC 2516 is well placed The open star cluster NGC 2516 (mag 3.8) in Volans culminates at around midnight local time. Fri, 20 Jan 2023 (527 days ago) in Carina

640.

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. Sat, 21 Jan 2023 at 00:14 EDT (526 days ago) in Sagittarius