37.96 36.98

37.80

37.15

37.64 37.31

37.48

Dist.

Dep.

54 58.84 37.51 58.68 37.68 38.52 37.85 38.35
55 39.56 58.21 39.40 38.38 29.23
56 40.28 38.90 40.11 89.08 39.94
57 41.00 39.60 40.83 39.77 40.66 39.95
58 41.72 40.29 41.55 40.47 41.37 40.65
59 42.44 40.98 42.2641.17 42.08 41.35
60 43.16 41.68 42.98 41.87 42.80 42.05
Lat. Dep. Lat.
30'

38.55 39.06 38.72

38.89

39.25

39.77 39.42

39.60

40.48 40.13

40.31

41.1940.83

41.01

Alt.

Q

MEAN REFRACTION.

App. Refr. App. Refr. App. Refr. App. Refr. App. [Refr.

Alt.

Alt.

Alt.

Alt.

4 5 11 40
4 10 11 29
5 42 18 20
4 15 11 18 9 15 5 39 18 30
4 20 11 89 20 5 36 18 40
4 25 10 58 9 25 5 34 18 50
4 30 10 48 9 30
5 31 19
4 35 10 39 9 35 5 28 19 10
4 40 10 29 9 40 5 25
4 45 10 20 9 45 5 23
4 50 10 11 9 50 5 20

9 5

5 45 18 10

2 52

28 45

1 44 77

0 0 13

9 10

19 20

19 30
19 40

2 51 29 0 2 49 29 30 2 47 30 0 2 46 30 30 02 44 31 0 2 43 31 30 2 41 32 0 2 40 32 30

00 9
00
00 7
00
0 0 4
002

TABLE 7.) TABLE 8.

Sun's Paral- Dip of the Horizon. Dip. at differ. Distances

4 50

4 36 1

4 42

233 26

52

6 27

TABLE II.

Apparent Time of Transit of Polestar.

1

This table is adapted to leapyear, particularly 1808. In order to make it serve for other years, the time of transit must be taken for the day following that given in the months of January and February. For the first year after leapyear, one minute is to be added to the time of transit given in the table; two minutes for the second, and three minutes for the third after leapyear.

Again, to reduce this table, to a different meridian than that to which it is adaqted, viz. Greenwich; if the longitude is between 45° E, and 45o W, there is no correction to be applied. If the longitude is between 45° and 135° E, one minute is to be added; but if it is between 45o and 135° W, one minute is to be subtracted. If the longitude is between 135° E, and 180°, two minutes are to be added, but subtracted if the given longitude is between 135° W, and 180o.

This table is useful to find the time when the altitude of the polestar ought to be observed, to find the latitude by its meridian altitude; it is also useful in finding the variation of the compass by the polestar.

Jan.¡ Feb. ¡ Mar.Ĵ April. May. | June. July. ( Aug. ¡ Sept. P. M. P. M. P. M. P. M. A. M. A.M. A.M. A.M. A.M. 6h 9' 3h56 2h 4' Oh 0' 10h19 8h:7' 6h13' 4h 9' 2h13' 26 43 52 2 0 0 710 15 8 13 6 94 5 2 10 36 03 48 1 57 0 3 10 12 8 9 6 54 1 2 6 45 55 3 441 53 0 010 88 56 3 57 2 3 A. M.

1

Oh25' 10h25' 8h22' 0 21 10 21 8 18 0 18 10 17 8 13 0 14 10 13 8 9

0 18

21 442 2 38 0 50 10 57 9 1 6255 4 52 2 541
224 38 2 340 47 10 53 8 586 51 14 48 2 50 0 58
234 33 2 300 43110 50 8 546 47 4 44 2 46
244 292 27 0 40 10 46 8 50 6 42
25 4 25 2 23 0 36 10 42 8-466 38 4 362 89
264 21 2 190 32 10 38 8 42 6 34 14 32
27 4 17 2 15 0 29 10 34 8 38 6 20 4 28
284 13 2 110 25 10 31 8 34 6 26 4 24
29 4 8 2 80 21
3044

1

11

11

0 54

11

4 402 43

0 51

0 47