Sky Chart For The Month of December, 2017

 


ASTRONOMICAL BULLETIN FOR DECEMBER 2017

The Moon

 

Full Moon occurs on 3rd at h. 21-17 I.S.T.

New Moon occurs on 18th at h. 12-00 I.S.T.

Last Quarter occurs on 10th at  h. 13-21 I.S.T.

First Quarter occurs on 26that h. 14-50 I.S.T.

The Lunar Crescent becomes first visible after the New Moon day in the evening of 20th.

The Moon is at Perigee or nearest to the Earth on 4th and at Apogee or farthest from the Earth on 19th.

The Moon passes about 4º north of Mars on 13th ,  about 4½º north of Jupiter on 14th, about 2º north of  Mercury and about  4º north of  Venus on 17th,  about 3º north of Saturn on 18th, about 1½ º south of  Neptune in the evening of 24th and   4½ º south of Uranus  before midnight of  27th.

The Earth

The Earth is at Winter Solstice on 21st.

The Planets

Visibility of Planets:

Mercury:   The planet sets about 1½   hours to 1 hour after sunset upto 8th of the month. Thereafter it becomes too close to the Sun to be visible, being in Inferior Conjunction with the Sun on 13th. It reappears again in the eastern sky before sunrise on 17th and remains visible till the beginning of morning twilight for the remaining days of the month. It rises about 1 hour to 1½ hours before it during the period. The motion of the planet becomes Retrograde with respect to the Earth from 3rd. The motion of the planet becomes Direct with respect to the Earth from 23rd.

Venus:   The planet is a brilliant object visible in the eastern sky which rises about ½  hour before sunrise and remains visible till the beginning of morning twilight upto 14th of the month. Thereafter it becomes too close to the Sun to be visible for the remaining days of the month.

Mars:   The planet rises about 2½ hours to 2 hours after local midnight and remains visible till the beginning of morning twilight throughout the month.

Jupiter: The planet rises before sunrise and remains visible till the beginning of morning twilight throughout the month. It rises about 2 hours to 2½  hours before sunrise  upto first quarter of the month, about 2½ hours to 3 hours before  it upto second quarter of the month, about 3 hours to 3½ hours before it upto third quarter of the month  and about 3½ hours to 4  hours before it for the remaining days of the month.

Saturn: The planet sets about 1½ hours to 1 hour after sunset upto 7th of the month. Thereafter it becomes too close to the Sun to be visible for the remaining days of the month, being in Conjunction with the Sun on 22nd.

Uranus:  The planet sets after  local midnight throughout the month. It sets about 3 hours to 2½ hours after it upto first quarter of the month, about 2½ hours to 2 hours after it upto second quarter of the month, about 2 hours to 1½ hours  after  it upto third quarter of the month and about 1½  hours to 1 hour after it for the remaining days of the month.

Neptune:   The planet sets before local midnight throughout the month. It sets about ½ hour to 1 hour  before it upto first quarter of  the month, about 1 hour to 1½ hours before it upto second quarter of the month, about 1½ hours to 2 hours before it upto third quarter of the month and about 2 hours to 2½ hours before it for the remaining days of the month.


Conjunction of Planet:

Mercury passes about 1½ º south of Saturn on 6th.

Venus passes about 5º north of Antares (Jyestha) on 8th.

Mercury passes about 2º north of Venus on 15th.

Venus passes about 1º south of Saturn on 25th.

 

Planets

Planets in Zodiacal Constellation

Magnitude

Mercury (Budha)

Moves from Sagittarius (Dhanus) to Scorpion (Vrischika) on 11th(Retrograde)

-0.1 to +2.1

+2.1 to -0.4

Venus (Sukra)

Moves from Scorpion (Vrischika) to Sagittarius (Dhanus)on 20th.

-3.9 to -4.0

Mars (Mangala)

Remains in Libra (Tula).

+1.7 to +1.5

Jupiter (Brihaspati)

Remains in Libra (Tula).

-1.7 to -1.8

Saturn (Sani)

Remains in Sagittarius (Dhanus).

 +0.5

Uranus

Remains in Aries (Mesha).

+6.0

Neptune

Remains in Aquarius (Kumbha).

+8.0

Source : : Director

Positional Astronomy Centre

India Meteorological Department

Salt Lake, Kolkata - 700 091.