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Immersion
Emersion

February 16th. Occultation of » H.

8h. 55m. 32.78. A. 8' 46" South of the

9 45 20.7 6 49 ) Centre. D's S. D. at Im. 16' 10.8”; at Em. 16' 8.3''.

February 19th and 20th. Occultation of Aldebaran. Immersion

19th, llh. 43m. 22.4s. A. 14' 27" North of the Emersion

20th, 0

5 45.6 M. 15 21 S Centre. D's S. D. at Im. 16' 11.6'' ; at Em. 16' 10.4".

February 28th. Occultation of 1 g m. Star rises eclipsed

8h. 2m. Os. A. Emersion

8 30 48.7 1' 5' South of the Centre. D's S. D. at Em. 15' 7.0"

Immersion
Emersion

March 18th. Occultation of g 8.

10h. 31m. 31.6s. A. 2' 5" South of the Centre.

11 24 12.5 0 29 North. D's S. D. at Im. 16' 16.3''; at Em. 16' 13.5'. * April 15th. Occultation of Aldebaran.

10h. 41m. 44.1s. M, 13' 34" North of the

11 24 21.5 10 35 S Centre. D's S. D. at Im. 16' 36.8'' ; at Em. 16.38.7''.

Immersion
Emersion

June 17th and 18th. Occultation of 1 y m. Immersion

17th, 11h. 51m. 16.7s. A. Star sets eclipsed

18th, 0 48

M.
D's S. D. at Im. 15' 7.0".

June 29th. Occultation of the Planet Jupiter and his Satellites.
Contact nearest limbs lh. 41m. 14.55. M.' 9' 44.2"-
Immersion of H's Centre 1 42 29.2 9 43.6
Total Immersion

1 43

44.9 9 42.9 South of the Contact nearest limbs 2 47 18.9 9 36.9 Centre. Emersion of H's Centre 2 48 35.8 9 37.3 Total Emersion

49 51.8 9 37.8 D's S. D. at Im. 15' 20.2"'; at Em. 15' 21.4" H's S. D. 21.60”.

Configuration of the Satellites at the Immersion, the Planet being

placed in the Centre. 3: ? O !

Immersion
Star sets eclipsed

July 19th. Occultation of y.

Oh. 34m. 27.8s. M. 2' 36" South of the Centre.

0 48
D's S. D. at Im. 14' 46.6".

Immersion
Emersion

Immersion
Emersion

August 28th. Occultation of 2 & Ceti.

Oh. 5m. 12.2s. M. 4' 12" South of the

1 8 27.8 6 58 S Centre. D's S. D. at Im. 16' 10.0"; at Em. 16' 12.7". August 29th.

Occultation of f 8. 4h. 18m. 48.33. M. 9' 54") South of the

5 15 38.1 12 43 S Centre. D's S. D. at Im. 16' 20.4"; at Em. 16' 20.5". *August 29th and 30th.

Occultation of y 8. 29th, 11h. 56m. 17.0s. A. 10' 15" North of the

30th, 0 44 0.8 M. 7 7 Centre. D's S. D, at Im. 16' 11.7"'; at Em. 16' 14.2''.

Immersion
Emersion

*August 30th. Occultation of Aldebaran. Immersion

8h. 28m. 6.7s. M. 0' 58" South of the Emersion

9 38 47.8 0 44 S Centre. D's S. D. at Im. 16' 20.9" ; at Em. 16' 18.4".

October 2d. Occultation of Regulus. Immersion

6h. 6m. 11.3s. M. 15' 4" North of the Emersion

6 34 33.7 14 11 ) Centre. D's S. D. at Im. 15' 52.6''; at Em. 15' 53.4".

October 14th. Occultation of yve. Immersion

8h. 9m. 55s. A. 7' 6'') North of the Emersion

9 24 24

5 40 S

Centre. D's S. D. at Im. 15' 7.6"; at Em. 15' 6.6".

* October 21st and 22d. Occultation of 1 u Ceti. Immersion

21st, 11h. 21m. 32.4s. A. 1' 15' ? South of the Emersion

22d, 0 35 4.3 M. 5 21 Centre. D's S. D. at Im. 16' 39.9''; at Em. 16' 40.9''.

* October 23d. Occultation of Aldebaran. Star rises

7h. 18m. Os. A. Immersion

7 28 53.6 7' 19" North of the Emersion

8 16 19.9

4 9 ) Centre. D's S. D. at Im. 16' 29.4"; at Em. 16' 31.8". December 9th. Occultation of the Planet Jupiter and of all his Satel

lites.

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Contact nearest limbs of D & 4 6 33 13.3 A. 4 36.6
Immersion of H's Centre

6 34 0.5 4 35.4 Total Immersion

6 34 47.7 4 34.1 North of the Contact nearest limbs

7 47 45.4 2 36.4 Centre. Emersion of H's Centre

n48 27.9 2 35.4 Total Emersion

749 10.5 2 34.4
D's S. D. at Im. 15' 2.9"; at Em. 15' 1.1. H's S. D. 17.08".

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This occultation will be visible throughout the United States, and will be the most interesting in the year.

Immersion
Emersion

* December 15th. Occultation of u Ceti.

9h. 40m. 45.6s. A. O' 31" North of the Centre.

10 56 17.6 2 44 SSouth. D's S. D. at Im. 16' 34.7''; at Em. 16' 33.9”'.

* December 17th. Occultation of Aldebaran.

Immersion
Emersion

4h. 53m. 35.4s. A. O' 6'' North of the Centre.

5 47 25.5 4 19 S South. D's S. D. at Im. 16' 44.0"; at Em. 16' 47.1".

December 24th.

Occultation of the Planet Saturn.

h. m.

8.

Contact nearest limbs of D & h 9 57 53.6 M. 1 18.6
Immersion of h's Centre

9 58 9.9 1 18.7 Total Immersion of h

9 58 26.2 1 18.8 | South of the Contact nearest limbs

10 55 31.6 1 55.0 Centre. Emersion of h's Centre

10 55 47.2 1 55.1 Total Emersion

10 56 2.7 1 55.3 )
D's S. D. at Im. 15' 49.7''; at Em. 15' 46.2”. h's S. D. 8.55''.

Appulses of the Moon to Planets and Stars in 1831, at Boston; all, or

nearly all, of which will be Occultations in some part of the United States.

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OCCULTATIONS OF THE PLANETS* AND OF THE STARS REGULUS

AND ALDEBARAN, VISIBLE IN 1831 IN THE CITY OF CHARLESTON, SOUTH CAROLINA, IN MEAN TIME, FOR THE MERIDIAN OF CHARLESTON.

February 13th. Occultation of Venus. Immersion of t Centre. Oh. 55ın. 59s. A. 14' 27" South of the Centre Emersion

1 30 57 15 24 S of the Moon. D's S. D. at Im. 16' 2.9"; at Em. 16' 3.0" $ S. D. 4.99".

Immersion
Emersion

February 19th. Occultation of Aldebaran.

10h. 55m. 57.7s. A. 3' 39" North of the

11 51 50.2 6 7 Centre. D's S. D. at Im. 16' 13.9''; at Em. 16' 10.8".

Immersion
Emersion

*April 15th.

Occultation of Aldebaran.
9h. 44m. 37.9s. M. 10' 14" North of the
10 34 58.6

6 21S Centre. D's S. D. at Im. 16' 33.7"; at Em. 16' 36.3".

June 29th. Occultation of Jupiter and his Satellites.

h. m.

s.

11

13 33.1

Contact nearest limbs D & 4 0 49 53.4 M.
Immersion of H's Centre 0 51 50.2 13 31.4
Total Immersion

0 53 55.8 13 29.5 South of the Contact nearest limbs

1 34 6.7 12 51.0 Centre. Emersion of the Centre

1 36 11 2 12 52.2 Total Emersion

1 38 6.7 12 50.5 J D's S. D. at Im. 15' 20.7"; at Em. 15' 22.2". H's S. D. 21.60".

August 30th. Occultation of Aldebaran. Immersion

7h. 51m. 51.1s. M. 10' 28' South of the Emersion

8 51 15.6

10 53 Centre. D's S. D. at Im. 16' 23.5"; at Em. 16' 20.8".

October 2d.

Immersion
Emersion

Occultation of Regulus.
4h. 57m. 53.8s. M. l10" North of the
6 4 44.8

4 2.3 Centre.

Diss. D. at Im. 15' 50.1"; at Em. 15' 52.9."

December 9th Occultation of Jupiter and all the Satellites.

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* It was originally intended to compute all the occultations of stars, of not less than the fifth magnitude, for Charleston and Washington, as well as for Boston ; but the calculation of the eclipse of the 12th of February occupied so much time (five months), that we were compelled to defer carrying our intention into full effect, until another year.

* December 17th. Occultation of Aldebaran. Star rises eclipsed 4h. 14m. Os. A. Emersion

4 56 52.2 7' 42.7" South of the Centre.

D's S. D. at Em. 16' 43.7".
December 24th. Occultation of Saturn.

b. m. S.
Contact nearest limbs D & h 9 39 38.3 M. 53.6
Immersion of the Centre 9 39 57.7 7 53.4
Total Immersion

940 17.0

7 53.3 South of the Contact nearest limbs

10 31 44.6

7 50.6 Centre. Emersion of the Centre 10 32 2.8

7 50.7 Total Emersion

10 32 21.0 7 50.8
D's S. D. at Im. 15' 50.7' ; at Em. 15' 47.2'. h's S. D. 8.55".

APPULSES OF THE MOON TO THE PLANETS AND THE PRINCIPAL

FIXED STARS, AT CHARLESTON, IN 1831. *January 23. Nearest Ap. D to a 8 at 3h. lm. A. * 2' 10" North. July 12.

q 요 6 2

10 October 29.

a 2 7 15 M. * 7 15

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The importance of large eclipses of the Sun and of occultations of stars and planets by the Moon, for the determination of terrestrial longitude (the latitude being always easily ascertained), has long been known. When thus carefully determined, it will be as near to the truth as when deduced from a very large number of lunar distances, or of transits of the Moon and a star; but where the tables of the Moon are relied on, the longitude, even thus obtained, is still somewhat uncertain, on account of the small error which is sometimes found in them; if, however, it is deduced from a corresponding observation of the same eclipse or occultation made in one of the observatories of Europe, or in any other place, of which geographical position is well determined, it will be free from this as well as other sources of error, if the observations are correctly made in both places.

On another account, the subject of occultations has at all times been an interesting and important one, both to the practical and theoretical astronomer; viz. they frequently present some remarkable phenomena with respect to light, when the edge of the Moon comes in contact with the star, the star sometimes appearing to be projected on the disc of the Moon. This circumstance has lately been very particularly attended to, and numerous instances are given by members of the Astronomical Society of London, who suppose that this appearance is more frequent (or at least more frequently recorded) as to Aldebaran, than as to any other star, accompanied, however, with anomalies, for which it is difficult to account.*

It is therefore hoped that our astronomers will be induced to look out for the occultations of this star, not only with a view to ascertain the longitude of the place of observation, but to determine whether it does not appear projected on the face of the Moon; in doing this, particular attention should be paid to the following circumstances.

* See a paper read before the Astronomical Society of London, by Mr. South, their Prosident, in the transactions of that Society in 1829; also remarks on the anomalies observed in the occultations of Aldebaran of August 21st, October 15th, and December 9th, samo year.

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