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

66

"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.

66

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),

Canadian River, Head-waters of,

Cape Ann, Thatcher's Island

37 1 33 N. Y.42 54 9

73 10 4 52 40 440 71 7 404 44 30.7 431 80 33 5 22 12 467 104 37 326 58 30.1 77 17 598

336

Mass. 42 38 19.4

42 38 10.9

70 34 104 42 6.7 470 70 34 104 42 16.7

49 36 42

46 16 35

Cape Cod (Long Point Light), Mass. 42 157.1 70 9 474 40 39.2 507

Cape Island, Lake of the Woods,

Cape Hancock (Mouth of Columbia River),

Castine,

Cedar Keys, Depot Island,
Chapel Hill (University),
Charleston (St. Mich.'s Ch.),
Charlestown (Bun. Hill Mon.),

Me. 44 22 30
29 7 27

N. C. 35 54 21
S. C. 32 46 33
Mass. 42 22 33.1

124 1 458 16 7
68 45 4 35
82 56 125 31 45
79 17 305 17 10
79 55 385 19 42.5 544
71 3 204 44 13.3 433

*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.

Machias Bay,

Me.

Mass. 42 28 3
44 33

70 56 284 43 45.9 441

Do. (Light),

67 22 4 29 28

Marblehead (Black-top Ch.), Mass. 42 30 23.7 70 50 324 43 22.1 450

Mexico, City of,

Middletown (Wesl. Univ.),

Milledgeville,

Milwaukee,

42 30 14

Mex.19 25 45
Conn. 41 33 8
Ga. 33 7 20
Wisc. 43 345

38 51 36
Ala. 30 41 26.2
Mex. 26 54 0
Mass. 41 33 33
Mex. 25 40 13

70 50 394 43 22.6 448 99 5 66 36 20 72 39 4 50 36 325 83 19 455 33 19.0 642 87 57 5 51 48.0 700 90 0 406 0 2.6 88 1 295 52 5.91033 101 39 186 46 37.2

69 59 194 39 57.3 477 100 25 366 41 42.4

Monomoy Point Light,

Monterey,

Monterey,

Montpelier,.

Montreal,