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

The Parallaxes and Semidiameters of the Planets are given in the "Nautical

Almanac."

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DIP OF THE SEA HORIZON AT DIFFERENT DISTANCES FROM IT.

[blocks in formation]
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37 0.7 5.1

13.4

220.6 264.1
264.9

311.6 363.1 418.4

117.9

118.4

28.1

25.7 41.8 61.9 86.0 113.9 145.8 181.6 221.3 312.5 364.0 419.4 38 0.8 5.2 13.6 25.9 42.1 62.3 86.4 114.4 146.3 182.2 222.0 265.7 313.3 364.8 420.3 39 0.8 5.3 13.8 26.2 42.5 62.7 86.8 114.9 146.9 182.8 222.7 266.4 314.1 365.7 421.3 40 0.9 5.4 14.0 26.4 42.8 630 87.3 115.4 147.5 183.5 223.4 267.2 315.0 366.6 422.2 41 0.9 5.6 14.1 26 6 43.1 63.4 87.7 115.9 148.0 184.1 224.1 267.9 315.8 367.5 423.2 42 1.0 5.7 14.3 26.9 43.4 63.8 88.1 116.4 148.6 184.7 224.8 268.7 316.6 368.4 424.2 43 1.0 5.8 14.5 27.1 43.7 64.2 88.6 116.9 149.2 185.4 225.5 269.5 317.4 369.3 425.1 44 1.1 5.9 14.7 27.4 44.0 64.5 89.0 117.4 149.7 226.2 270.3 318.3 370.2 426.1 45 1.1 6.0 148 27.6 44.3 64.9 89.5 46 1.2 6.1 15.0 27 9 44.6 65.3 89.9 47 1.2 6.2 15.2 44.9 65.7 90.3

186.0

150.3

186 6

226.9

271.0 319.1 371.1 427.0

150 9

187.3

227.6

271.8 319.9 372.0

428.0

118.9 151.5

187.9

[blocks in formation]

48 1.3 6.4 15.4

49 1.3 6.5 15.6
50 1.4 6.6 15.8 28 8 45.9 66.8 91.7 120.5 153.2
51 1.4 6.7 15.9 29.1 46.2 67.2 92.1 121.0 153 8
52 1.5 6.8 16.1 29.4 46.5 67.6 92.6 121.5 154.4
53 1.5 7.0 16.3 29.6 46.8

28.3 45.2 66.0 90 8 119.5 152.0 188.5
28.6 45.5 66.4 91.2 120.0 15.6 189.2 229.7 274.1 322.4 374.7 430.9

[blocks in formation]

68.0

93 0

122.0 154.9

[blocks in formation]
[blocks in formation]
[blocks in formation]

58

.7444 .6830

58 .7698 .6212

58

.8058 .5112
.8065 .5087 58

56 .9548 .2817

54 .8539 .2876

.8558 .2758

4 0 7.7447 7,6823 6 0 7.7703 7,6198 8 0 7,8072 7,5062 10 0 7.8567 7,2697

In Table 16 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.

TABLE XV.

LENGTH OF A SECOND OF LATITUDE AND LONGITUDE IN FEET ON THE SURFACE OF THE EARTH, THE COMPRESSION BEING TAKEN AS 300.

[blocks in formation]

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

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