401.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Thu, 20 Sep 2018 at 01:19 EDT (2,156 days ago) in Capricornus

402.

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. Wed, 19 Sep 2018 at 20:53 EDT (2,157 days ago) in Capricornus

403.

Asteroid 30 Urania at opposition Asteroid 30 Urania makes closest approach to the Earth. Wed, 19 Sep 2018 at 10:22 EDT (2,157 days ago) in Pisces

404.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Mon, 17 Sep 2018 at 12:43 EDT (2,159 days ago) in Sagittarius

405.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 2°03'. Mon, 17 Sep 2018 at 12:29 EDT (2,159 days ago) in Sagittarius

406.

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. Sun, 16 Sep 2018 at 19:15 EDT (2,160 days ago) in Ophiuchus

407.

Mars at perihelion Mars passes its orbit's closest point to the Sun. Sun, 16 Sep 2018 at 08:53 EDT (2,160 days ago) in Capricornus

408.

Comet 21P/Giacobini-Zinner passes perihelion Comet 21P/Giacobini-Zinner makes its closest approach to the Sun. Fri, 14 Sep 2018 (2,162 days ago) in Auriga

409.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Fri, 14 Sep 2018 at 00:43 EDT (2,162 days ago) in Libra

410.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 4°22'. Thu, 13 Sep 2018 at 22:19 EDT (2,163 days ago) in Libra

411.

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. Tue, 11 Sep 2018 at 22:12 EDT (2,165 days ago) in Virgo

412.

New Moon The Moon disappears into the Sun's glare for a few days. Sun, 09 Sep 2018 at 14:02 EDT (2,167 days ago) in Leo

413.

September ε-Perseid meteor shower 2018 The September ε-Perseid meteor shower reaches its peak. Sun, 09 Sep 2018 (2,167 days ago) in Perseus

414.

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. Fri, 07 Sep 2018 at 21:19 EDT (2,169 days ago) in Leo

415.

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. Fri, 07 Sep 2018 at 14:18 EDT (2,169 days ago) in Aquarius

416.

Close approach of the Moon and M44 The Moon and M44 pass close to each other. Thu, 06 Sep 2018 at 22:26 EDT (2,170 days ago) in Cancer

417.

Saturn ends retrograde motion Saturn returns to its usual eastward motion after opposition. Thu, 06 Sep 2018 at 07:19 EDT (2,170 days ago) in Sagittarius

418.

Venus at aphelion Venus passes the furthest point along its orbit from the Sun. Wed, 05 Sep 2018 at 07:32 EDT (2,171 days ago) in Virgo

419.

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, 02 Sep 2018 at 22:37 EDT (2,174 days ago) in Taurus

420.

Lunar occultation of Aldebaran The Moon will pass in front of Aldebaran (Alpha Tauri), creating a lunar occultation visible from Greenland, Iceland and Canada. Sun, 02 Sep 2018 at 21:36 EDT (2,174 days ago) in Taurus