21.

136199 Eris at opposition 136199 Eris is well placed in the sky. Sun, 17 Oct 2021 at 12:40 EST (41 days ago) in Cetus

22.

The Moon at aphelion The Moon reaches its furthest point from the Sun. Sun, 17 Oct 2021 at 21:12 EST (41 days ago) in Aquarius

23.

Jupiter ends retrograde motion Jupiter returns to its usual eastward motion after opposition. Mon, 18 Oct 2021 at 01:13 EST (40 days ago) in Capricornus

24.

ε-Geminid meteor shower 2021 The ε-Geminid meteor shower reaches its peak. Mon, 18 Oct 2021 (40 days ago) in Gemini

25.

Mercury at perihelion Mercury reaches its closest point to the Sun. Tue, 19 Oct 2021 at 19:51 EST (39 days ago) in Virgo

26.

Full Moon The Moon is visible for much of the night. Wed, 20 Oct 2021 at 10:56 EST (38 days ago) in Pisces

27.

Orionid meteor shower 2021 The Orionid meteor shower reaches its peak. Thu, 21 Oct 2021 (37 days ago) in Orion

28.

136108 Haumea at solar conjunction 136108 Haumea is unobservable as it passes around the far side of the Sun. Thu, 21 Oct 2021 at 18:08 EST (37 days ago) in Bootes

29.

Close approach of the Moon and Uranus The Moon and Uranus pass within 1°14' of each other. Thu, 21 Oct 2021 at 18:39 EST (37 days ago) in Aries

30.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Sat, 23 Oct 2021 at 18:40 EST (35 days ago) in Virgo

31.

Leonis Minorid meteor shower 2021 The Leonis Minorid meteor shower reaches its peak. Sun, 24 Oct 2021 (34 days ago) in Leo Minor

32.

The Moon at apogee The Moon appears small as it recedes to its furthest point from the Earth. Sun, 24 Oct 2021 at 11:28 EST (34 days ago) in Taurus

33.

Mercury at highest altitude in morning sky Mercury is bright and well placed in the dawn sky. Sun, 24 Oct 2021 (33 days ago) in Virgo

34.

Mercury at greatest elongation west Mercury is bright and well placed in the dawn sky. Sun, 24 Oct 2021 at 23:45 EST (34 days ago) in Virgo

35.

NGC 869 is well placed The open star cluster NGC 869 (mag 4.0) in Perseus, also known as the western half of the double cluster is well placed in the sky. Tue, 26 Oct 2021 (32 days ago) in Perseus

36.

NGC 884 is well placed The open star cluster NGC 884 (mag 4.0) in Perseus, also known as the eastern half of the double cluster is well placed in the sky. Wed, 27 Oct 2021 (31 days ago) in Perseus

37.

Venus at dichotomy Venus reaches half phase in the evening sky. Thu, 28 Oct 2021 at 10:28 EST (30 days ago) in Ophiuchus

38.

Moon at Last Quarter The Moon rises in the east at around midnight and appears high in the sky at sunrise. Thu, 28 Oct 2021 at 16:05 EST (30 days ago) in Cancer

39.

Venus at greatest elongation east Venus is bright and well placed in the evening sky. Fri, 29 Oct 2021 at 10:57 EST (29 days ago) in Ophiuchus

40.

Fornax is well placed The Fornax dwarf spheroidal galaxy (mag 9.0) is well placed in the sky. Sun, 31 Oct 2021 (27 days ago) in Fornax