D's S. D. at Im. 15′ 3.7"; at Em. 15' 4.7". * April 8th and 9th. Occultation of Ophiuchi. July 8th. Occultation of r H. Immersion Star rises 7th Immersion Emersion 8th Immersion Immersion 2h. 41m. 59s. M. 3' 22'' 4 5 58 South of D's 7 42 S Centre. D's S. D. at Im. 14' 56.5"; at Em. 14' 58.2". * August 7th and 8th. Occultation of u Ceti. * November 1st. Star rises eclipsed Immersion Occultation of μœ. 8h. 26m. Os. A. 8 53 5 7′ 29′′ North of D's Centre. D's S. D. at Em. 15' 40.6". +* November 29th. Occultation of n. Oh. 8m. 41s. M. 0 37 52 η 13' 42" South of D's 15 51 S Centre. D's S. D. at Im. 16' 1.2"; at Em. 16' 1.8". * Nov. 29th, 5h. 24m. M. Nearest Ap. D to μ .*1' 39'' South of D. * Dec. 18th, 10 59 A. 66 66 r H. * 5 10 66 66 ECLIPSES OF THE SATELLITES OF JUPITER IN 1833, Visible throughout or in some part of the United States, in Mean time for the Meridian of Greenwich, reckoned according to the Manner of Astronomers, who begin the day at the noon of the civil day and count the hours up to 24, or to the succeeding noon, when another day is commenced. h. p. 1. 1832, Dec. 31 6 A. 1833, Feb. 9 Position and Magnitude of the Rings of Saturn, according to Bessel and Struve. a. น -4°23′+3°10′ 41.68"+2-30" 233°41′ 190°36′ b. U. 232 55 189 50 The Earth coming into the plane of the Rings, The Earth again coming into the plane of the * The Earth will be above the plane of the Rings, until April 30th, 4h. A.; the rings will then disappear, and will continue invisible forty days, as, during that interval, their p. Angle of the semiconjugate axis of the ring with the circle of declination, positive when east, negative when west. 1. Angle of elevation of the Earth above the plane of the rings, as seen from Saturn, positive when north, negative when south. a. Semitransverse axis of the rings. b. Semiconjugate axis of the rings; positive when their northern surface is visible, negative when their southern. u. Longitude of the Earth as seen from Saturn, reckoned on the plane of the rings and from their ascending node in the equator. u'. The same longitude reckoned from their ascending node in the ecliptic. *** It has been recently discovered, that Saturn is not placed exactly in the centre of the rings. This singular circumstance was for some time considered an optical illusion, occasioned by the shadow of the planet on the ring; but Professor Struve has ascertained, with the celebrated Dorpat telescope, that the rings are actually eccentric. The eccentricity is, however, too small to be perceived by any other than the very best and most powerful telescopes. ASPECTS OF THE PLANETS IN 1833. The inferior planets (Mercury and Venus), from their superior to their inferior conjunctions, and the superior planets, from their opposition to their conjunction, pass the meridian between noon and midnight, and usually set in the evening after the Sun. The inferior planets, from their inferior to their superior conjunctions, and the others, from their conjunctions to their oppositions, pass the meridian between midnight and noon, and usually rise before the Sun in the morning. southern side will not be illuminated by the sun. On June 9th, 0 M. the Earth will again come into, and then pass above, the plane of the rings, and render them visible for the remainder of the year. Mercury, stationary, January 4th; at greatest western clongation (24° 1′) January 15th; at superior ♂ March 2d; at greatest eastern elongation, March 28th; stationary, April 5th; at inferior o April 15th; stationary, April 29th; at greatest western elongation (23° 25′) May 14th; at superior ♂ June 17th; at greatest eastern elongation (27° 9′) July 25th; stationary, August 8th; at inferior ♂ August 22; stationary, September 1st; at greatest western elongation (17° 57′) September 8th; at superior, d October 4th; at greatest eastern elongation (22° 6′) November 19th; stationary, November 29th; at inferior ♂ December 9th; stationary, December 19th; at greatest western elongation (22° 32′) December 28th. The most favorable opportunities in the course of this year for viewing this planet, will be in the morning, before sunrise, in the beginning of January, the beginning of September, and the latter part of December; and in the evening, after sunset, in the latter part of March and the latter part of June; as, at these times, the planet will not only be near its greatest elongation, but will be nearer the elevated pole than the Sun, and consequently will remain longer above the horizon. Venus, at greatest eastern elongation (46° 19′) March 6th; most brilliant as evening star, March 26th; stationary, April 25th; at inferior ♂ May 17th; stationary, June 7th; most brilliant as morning star, July 6th; at greatest western elongation (45° 45') July 26th; at superior ♂ March 7th, 1834. Mars, in quadrature, March 1st; in conjunction, November 1st. Juno, in opposition, May 6th; in quadrature, August 2d; in conjunction, December 7th. Pallas, in conjunction, May 5th; in quadrature, October 28th. Ceres, in quadrature, January 26th; in conjunction, June 20th; in quadrature, November 26th. Jupiter, in conjunction, April 1st; in quadrature, July 27th; stationary, August 25th; in opposition, October 23d; stationary, December 21st. Saturn, in opposition, March 15th; stationary, May 23d; in quadrature, June 12th; in conjunction, September 24th; in quadrature, January 1st, 1834. Uranus, in conjunction, February 7th; in quadrature, May 13th; stationary, May 26th; in opposition, August 13th; stationary, October 28th; in quadrature, November 11th. All the superior planets, except Mars, Pallas, and Ceres, will come into opposition in the course of this year. The oppositions will take place as follows, viz; of Saturn, March 15th; of Juno, May 6th; ofta, July 6th; of Uranus, August 13th; and of Jupiter, October 23d. |