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The Parallaxes and Semidiameters of the Planets are given in the Nautical Almanac.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

DIP OF THE SEA HORIZON AT DIFFERENT DISTANCES FROM IT.

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[blocks in formation]

1 0-0 2-0

8.0

17.9 31.7 49.4

71.1

2 0-0 2-1

8-1

18-1 31-9 49.7

71.5

3 0-0 2-2

8-2

18-3 32-2 50-1

71.9

4 0-0 2-2

8.4

18.5 32.5 50-4

72-3

5 0-0 2-3 8.5

18-7

[blocks in formation]
[blocks in formation]

96.7 126-2 1596 1970 238-3 283-5 332-6 385-6 97-1 126.7 160-2 197-6 239.0 284-2 333.4 386-6 97.6 127-2 160.8 198-3 239-7 285-0 334-3 387-5 98.0 127.8 161.4 198-9 2404 285.8 335-2 388-4 98.5 128-3 162.0 199-6 241-2 286.6 336.0 389-3 99.0 128-8 162-6 200-3 241.9 287.4 336.9 390-2 99-4 129.3 163.2 200-9 242-6 288-2 337-7 391-1 99-9 129.9 163.8 2016 243-3 289.0 338-6 392-1 100-4 130-4 164.4 202-2 244-1 289-8 339-4 393-0 100-8 131.0 165-0 202-9 244-8 290-6340-3 393-9 101-3 131.5 165.6 203.6 245.5 291-4 341.2 394-8 101-8 132 0 166.2 204-2 246.3 292-2 342-0 395-8 102.3 132.6 166.8 204.9 247 0 293-0 342-9 396-7 76.3 102.7 133-1 167.4 2056 247.7 293-8 343-7 397.6 9.9 20.7 35.5 54.1 76.7 103-2 1336 168.0 206-3 248.5 294.6 344-6 398-6 10-1 20-9 35.7 54.5

6 0.0 2.4

7 0.0 2.4 8.8 19.1

33.3

51.4

73.5

8 0.0 2.5

8-9 19.3

33.5

51.7

73.9

9 0-0 2-6

9.1 19.5

33.8

52.1

74.3

10 0-1 2-7

9.2 19.7

34.1 52.4 74.7

11 0-1 2-7

9.4 19-9

34.4

52.7

75-1

12 0.1 2.8 9.5 20-1

34.6 53.1

75.5

13 0-1 2-9

9.6 20.3

34.9 53.4 75.9

14 0-1 3-0

9.8 20.5

35.2 53.8

15 0-1 3-1

16 0-1 3-1 17 0-2 3-2 18 0-2 3-3

19 0-2 3-4

10-2

10-4

21-2 36.0 54.8
21.4 36.3 55.1

10.5 21.6 36.6 55.5

21.8 36.9 55.8
37.2 56.2

37.4

20 0-2 35 107

21 0-2 3-6 10-8

22-0

22 0.3 3.7 11.0

22-3

23 0-3 3-8 11.2

22.5

37.7

24 0.3 3.8 11.3

25 0-3 3-9 11.5 26 0.4 4.0 11.6

34 0.6 4.8 12.9

35 0.7 4.9 13.1

36 0.7 5.0 13-3

22.7 38.0

22.9

38.3

56.5

77.1 103-7 134-2 168.6 206-9 249-2 295-4 345.5 399-5 77.5 104-2 134-7 169-2 207-6 249.9 296-2 346.4 | 400'5 77.9 104.6 135.3 169-8 208-3 250-7 297.0 347-2 401-4 78-3 105-1 135-8 170.4 208.9 2514 297.8 348-1 402-3 78.8 105-6 136.3 171-0 209.6 252-2 298-6 349.0 403-3 79-2 106-1 136-9 171-6 210-3 253-0 299-4 349-8 404-2

79.6 106.6 137.4 172-2 2110 253-6 300-2 350-7 405-1 56.9 80.0 107·0 138.0 172-9 211-7 254.4 301.0 351.6 406-0 57.3 804 107.5 138-5 173-5 212-3 255-1 301-8 352.5 407.0 57.6 80.8 108.0 1391 174-1 2130 255.9 302.6 353-3 408-0

23.1 38.6 58.0 81.3 108.5 1396 1747 213-7 256-6 303-5 354-2 408-9
23.4 38.9 58.3
1090 140-2 175-3 2144 257-4 304-3 355 1 409-9

27 0-4 4-1 11.8
28 0.4 4.2 11.9 23.6 39.2 58.7
29 0.5 4.3 12.1 23-8 39.5
59.0
30 0.5 4.4 12.3 24.0 39.8
59.4
31 0.5 4.5 12.4 24-3 401 598 83.4 110-9 142.4 177.8 217.1 260.4 307.5 358.6 413-6
32 0.6 4.6 12.6 24.5 40'3
60-1
83.8 111.4 143.0 178-4 217.8 261-1 308-4 359.5 414-6
33 0.6 4.7 12.8
24.7 40.6 60.5 84.2 111-9 143.5 179-0 218.5 261-9 309-2 360-4 415.5
25.0 409 608 84-7 112.4 144-1 179.7 219-2 262-6 3100 361-3 416.5
25-2 412 612 85-1 112-9 1446 180-3 219.9 263.4 310-8 362.2 417.5
25.4 41.5 61.6 85.5 113.4 145.2 180.9 220.6 264-1 311.6 363-1 418-4
25.7 418 61.9 86.0 113.9 145-8 181-6 221-3 264.9 312-5 364.0 419-3
86.4 114.4 146-3 182-2 222-0 265.7 313-3 364-8 420-3
86.8 114.9 146-9 182-8 222.7 266-4 314-1 365-7 421-3
115.4 147.5 183.5 223-4 267-2 315.0 366.6 422-2
115.9 148.0 184-1 224-1 267.9 315-8 367.5 423-2
116.4 148-6 184-7 224-8 268-7 316.6 368-4 424-2
116-9 149-2 185-4 225.5 269.5 317.4 369-3 425-1
117.4 149-7 186.0 226.2 270-3 318-3 370-2 426-1
1179 150-3 186.6 226-9 271-0 319-1 371-1 427-0

81.7
82-1 109-5 140-7 175-9 215-1 258-1 305 1 356.0 410-8
82.5 110.0 141-3 176-6 215-8 258-9 305.9 356-9 411-7
83.0 110-4 141.8 177-2 2164 259.6 306-7 357.7 412-7

37 0.7 5.1 13.4
380-8 5.2 13.6

25.9 42°1 62.3

39 0-8 5.3 13.8 26.2 42.5 62.7
40 0-9 5-4 14.0 26.4 42.8 63.0 87.3
41 0-9 5.6 14.1 26.6 43′1 634 87.7
42 1-0 5-7 14.3 26.9 43.4 63.8 88.1
43 1-0 5-8 14.5 27.1 437 64.2 88.6
44 1-1 5-9 14.7 27.4 440 645 89.0
45 1.1 6.0 14.8 27.6 44.3 64.9 89.5

46 1-2 6-1 15.0 27.9 446 65-3 89-9 118-4 1509 187-3 227.6 271-8 319-9 372-0 428-0
47 1-2 6-2 15-2 28-1 44.9 657 90.3 118-9 151-5 187-9 228-3 272-6 320-8 372-9 429-0
48 1.3 6.4 15.4 28.3 45°2 66.0 90.8 119.5 152.0 188.5 229.0 273-3 321-6 373-8 429-9
49 1.3 6.5 15.6 28.6 45.5 66.4 91-2 120.0 152-6 189-2 229-7 274-1 322-4 374-7 430-9
50 1.4 6.6 15.8 28.8 45.9 66.8 91.7 120-5 153-2 189-8 230-4 274.9 323-3 375-6 431-9
51 1-4 6-7 15.9 29.1 46°2 672 92-1 121-0 153-8 190-5 231-1 275-6 324-1 376.5 432-8
52 1.5 6.8 16:1
29.4 46.5 67.6 92-6 121.5 154-4 191-1 231-8 276-4 325.0 377-4 433-8
53 1.5 7.0 16-3 29.6 46.8 68.0 93.0 122-0 154-9 191-8 232.5 277.2 325-8 378-3 434-8
54 1.6 7.1 16.5 29.9 47°1 68.3 93.5 122-5 155-5 192-4 233-2 278.0 326-7 379-3 435-8
55 1.6 7.2 16.7 30.1 47.5 68.7 93.9 123-1 156-1 193-1 234.0 278.8 327.5 380-2 436-7
56 1.7 7.3 16-9 30-4 478 69.1 944 123-6 156-7 193-7 234-7 279.5 328-4 381-1 437-7
30.6 48.1 69.5 94.8 124-1 157-3 194.4 235.4 280-3 329-2 382-0 438-7
30-9 48.4 69.9 95.3 124-6 157-8 195.0 236-1 281-1 330-0 382-9 439-7
31-1 48.8 70-3 95-7 125-1 158-4 195-7 236-8 281.9 330-9 383-8 440-6

57 1.8 7.5 17.1

58 1.8 7.6 17.3

59 1.9 7.7 17.5

Table XVIII. of Mr. Baily extends to 36 minutes from the meridian.

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In Table XVI. of Mr. Baily, the Equation of equal Altitudes is given for the entire interval of 24 hours, but it is seldom required beyond the above limits.

R

TABLE XV.

LENGTH OF A SECOND OF LATITUDE AND LONGITUDE IN FEET

ON THE SURFACE OF THE EARTH, THE COMPRESSION BEING

[blocks in formation]

One second of time, at the Equator = 1521.3 feet, or 507 yards.

Puissant, calculating the compression from the measurement of the great arc in France, obtains different results on different sides of the Meridian of Paris, making it as low as

1 230

1

5 on the side of the Atlantic, and 365 to the Eastward; which latter quantity is generally assumed on the Continent.

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