401.

Asteroid 20 Massalia at opposition Asteroid 20 Massalia makes closest approach to the Earth. Sat, 21 Mar 2026 at 12:46 EDT (149 days ago) in Virgo

402.

Neptune at solar conjunction Neptune is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Sun, 22 Mar 2026 at 07:09 EDT (148 days ago) in Pisces

403.

The Moon at perigee The Moon makes its monthly closest approach to the Earth, appearing larger than at other times of the month – though only very fractionally. Sun, 22 Mar 2026 at 07:39 EDT (148 days ago) in Aries

404.

Close approach of the Moon and M45 The Moon and M45 pass close to each other. Mon, 23 Mar 2026 at 04:53 EDT (147 days ago) in Taurus

405.

Lunar occultation of Beta Tauri The Moon will pass in front of Beta Tauri (Elnath), creating a lunar occultation visible from countries and territories including Brazil, Venezuela, Colombia and Guyana amongst others. Tue, 24 Mar 2026 at 18:37 EDT (146 days ago) in Taurus

406.

Saturn at solar conjunction Saturn 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, 25 Mar 2026 at 04:45 EDT (145 days ago) in Pisces

407.

Moon at First Quarter The Moon reaches first quarter phase – appearing high in the sky at sunset and remaining visible until around midnight. Wed, 25 Mar 2026 at 15:18 EDT (145 days ago) in Auriga

408.

Mars at perihelion Mars passes its orbit's closest point to the Sun. Thu, 26 Mar 2026 at 02:41 EDT (144 days ago) in Aquarius

409.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 3°52'. Thu, 26 Mar 2026 at 08:12 EDT (144 days ago) in Gemini

410.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Thu, 26 Mar 2026 at 09:19 EDT (144 days ago) in Gemini

411.

Mercury at highest altitude in morning sky Mercury is bright and well placed in the dawn sky. Fri, 27 Mar 2026 (143 days ago) in Aquarius

412.

Close approach of the Moon and M44 The Moon and M44 pass close to each other. Fri, 27 Mar 2026 at 23:54 EDT (143 days ago) in Cancer

413.

Lunar occultation of Regulus The Moon will pass in front of Regulus (Alpha Leonis), creating a lunar occultation visible from parts of Africa, Asia, Europe, Russia, British Indian Ocean Territory, Corsica, Menorca, Mallorca, Ibiza and RAF Akrotiri. Sun, 29 Mar 2026 at 15:57 EDT (141 days ago) in Leo

414.

136472 Makemake at opposition 136472 Makemake is optimally positioned for observation. Wed, 01 Apr 2026 at 07:15 EDT (138 days ago) in Coma Berenices

415.

The Sombrero Galaxy is well placed The Sombrero Galaxy M104 (NGC 4594; mag 8.6) in Virgo culminates at around midnight local time. Wed, 01 Apr 2026 (138 days ago) in Virgo

416.

Full Moon The Moon reaches full phase and is visible for much of the night. Wed, 01 Apr 2026 at 22:11 EDT (138 days ago) in Virgo

417.

Mercury at greatest elongation west Mercury is bright and well placed in the dawn sky. Fri, 03 Apr 2026 at 14:48 EDT (136 days ago) in Aquarius

418.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Fri, 03 Apr 2026 at 18:17 EDT (136 days ago) in Aquarius

419.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Sat, 04 Apr 2026 at 06:33 EDT (135 days ago) in Aquarius

420.

Comet C/2026 A1 (MAPS) passes perihelion Comet C/2026 A1 (MAPS) makes its closest approach to the Sun. Sat, 04 Apr 2026 (135 days ago) in Pisces