541.

Centaurus A is well placed Centaurus A (NGC 5128; mag 7.0) culminates at around midnight local time. Sun, 13 Apr 2025 (272 days away) in Centaurus

542.

Omega Centauri is well placed The brightest globular cluster in the sky, Omega Centauri (mag 3.6) culminates at around midnight local time. Sun, 13 Apr 2025 (272 days away) in Centaurus

543.

The Whirlpool Galaxy is well placed The Whirlpool Galaxy M51 (NGC 5194; mag 8.4) in Canes Venatici culminates at around midnight local time. Mon, 14 Apr 2025 (273 days away) in Canes Venatici

544.

136199 Eris at solar conjunction 136199 Eris is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Mon, 14 Apr 2025 at 22:44 EDT (273 days away) in Cetus

545.

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. Tue, 15 Apr 2025 at 19:07 EDT (274 days away) in Libra

546.

Conjunction of Mercury and Neptune Mercury and Neptune share the same right ascension, at a separation of 41'. Wed, 16 Apr 2025 at 14:32 EDT (275 days away) in Pisces

547.

Mars at aphelion Mars passes the furthest point along its orbit from the Sun. Wed, 16 Apr 2025 at 16:38 EDT (275 days away) in Cancer

548.

Lunar occultation of Antares The Moon will pass in front of Antares (Alpha Scorpii), creating a lunar occultation visible from countries and territories including Antarctica, South Africa, Namibia and Botswana amongst others. Wed, 16 Apr 2025 at 18:52 EDT (275 days away) in Scorpius

549.

Messier 83 is well placed The Southern Pinwheel Galaxy M83 (NGC 5236; mag 7.2), a face-on spiral galaxy in Hydra culminates at around midnight local time. Wed, 16 Apr 2025 (275 days away) in Hydra

550.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Thu, 17 Apr 2025 at 09:32 EDT (276 days away) in Pisces

551.

Messier 3 is well placed The globular cluster M3 (NGC 5272; mag 6.3) in Canes Venatici culminates at around midnight local time. Thu, 17 Apr 2025 (276 days away) in Canes Venatici

552.

Mercury at highest altitude in morning sky Mercury is bright and well placed in the dawn sky. Sat, 19 Apr 2025 (278 days away) in Pisces

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. Sun, 20 Apr 2025 at 21:36 EDT (279 days away) in Capricornus

554.

Mercury at greatest elongation west Mercury is bright and well placed in the dawn sky. Mon, 21 Apr 2025 at 11:06 EDT (280 days away) in Pisces

555.

136108 Haumea at opposition 136108 Haumea lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Tue, 22 Apr 2025 at 05:14 EDT (281 days away) in Bootes

556.

Lyrid meteor shower 2025 The Lyrid meteor shower reaches its peak. Tue, 22 Apr 2025 (281 days away) in Hercules

557.

Messier 101 is well placed The Pinwheel Galaxy M101 (NGC 5457; mag 7.9) in Ursa Major culminates at around midnight local time. Tue, 22 Apr 2025 (281 days away) in Ursa Major

558.

π-Puppid meteor shower 2025 The π-Puppid meteor shower reaches its peak. Wed, 23 Apr 2025 (282 days away) in Puppis

559.

Venus at greatest brightness Venus reaches its greatest brightness in the dawn sky. Thu, 24 Apr 2025 at 02:02 EDT (283 days away) in Pisces

560.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Thu, 24 Apr 2025 at 11:41 EDT (283 days away) in Cetus