OCCULTATIONS. Elements for facilitating the Calculation of Occultations visible at Washing Feb. 37 Leonis 3 70 Virginis 44 Mar. 2 3579 B.A.C. 11 A Ophiuchi 4 29 42 Leonis Apr.18 Venus 300 Virginis 4 May 5 3 Sagittarii 5 102 Aquarii 4 28 A Virginis 4 June28 3 Sagittarii 5 30 Sagittarii 4 July 7o Piscium 28 7077 B.A.C. Aug. 6 A1 Tauri 28 Aquarii Oct. 41 Cancri 212 Aquarii 29 136 Tauri Nov.19 27 Piscium 26 47 Geminor. Dec.20 32 Tauri 24 c Geminor. 6 1 6 5 5 5 6 1 10 30M. 5 10 11 45A. 4 7 52 10.91 25 47 11.2N. 26 27N. 76N. IN. 23 10 25.08 9 58 10.4S. 19 23 59 278. 47 15 666 5 A Table showing the Illuminated Portions of the Discs of Venus and Mars. THE numbers in this table are the versed sines of that portion of the discs which, to an observer on the Earth, will appear to be illuminated, the apparent diameters of the planets at the time being considered as unity. To a spectator on the Earth, Venus appears most brilliant when her elongation is about 45°, and she is approaching her inferior conjunction, or receding from it; in 1855 in August and November. Mars is most brilliant about the time of his opposition to the Sun, being then also nearest to the Earth; in which position he will not be this year. ECLIPSES OF THE SATELLITES OF JUPITER IN 1855, Visible in the United States between Sunset and Sunrise, Mean Time, Washington Observatory (Astronomical account). Position and Magnitude of the Rings of Saturn, according to Bessel and Struve, for every Fortieth Day in the Year, at 7 hours in the Morning. a denotes the outer semi-transverse axis of the outer ring. b "outer semi-conjugate axis of the outer ring, positive when the northern surface is visible, negative when the southern. p denotes the inclination of the northern semi-conjugate axes of the rings to the circle of declination; when East, when West. "angle of elevation of the Earth above the plane of the rings, as seen from Saturn; when North, when South. angle of elevation of the Sun above the plane of the rings, as seen from Saturn; + when North, when South. The inner semi-transverse axis of the inner ring is two thirds of a, diminished by 0".07. The inner semi-conjugate axis of the inner ring is two thirds of b. เ LATITUDE AND LONGITUDE OF THE PRINCIPAL PLACES IN THE UNITED STATES, ETC.* [The Longitudes are reckoned from Greenwich.] The Capitals (Seats of Government) of the States and Territories are designated by Italic Letters. Do. (South Light), 42 38 10 9 70 34 104 42 6.7 470 70 34 104 42 16.7 Cape Cod (Long Point Light), Mass. 42 1 57.1 70 9 474 40 39.2 507 Cape Island, Lake of the Woods, Cape Hancock (Mouth of Co lumbia River), Castine, Cedar Keys, Depot Island, 49 36 42 46 16 35 Me. 44 22 30 N. C. 35 54 21 *The positions contained in this table have been derived from that given in the American Almanac for 1841; with additions and corrections from the determinations of the Coast Survey, and of the United States Topographical Engineers. |