Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση
[ocr errors][merged small][merged small][ocr errors][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][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][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][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]

TABLE 11.

Apparent Time of Transit of Pole Star.

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

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

This table is useful to find the time when the altitude of the pole sar 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 pole star.

[blocks in formation]

9 52 7 49
9 48 7 45
9 45 7 4
9 417 36 5 32
9 37 7 325 28
9 33 7 285 24

85 38 3 281 38 11 45 915 33 8 2413411 41 105 29 3 20

I II 8
4

lo

311 38 115 25 3 16 I 27 11 37 125 20 3 12 23 11 33 135 16 3 8 2011 20 145 12 3 4 16 11 23 OI 12 11 19 155 73 165 3 2 57 11 9 11 16 17 4 59 2 531 5 11 12 184 552 50 1 194 50 2 460 5811 204 46 2 42 54 IT I 2114 42 2 38 10 50 10 57 6 554 522 54 1 22 4 38 2 34 0.47 10 6 5 4 4 2 500 58 234 33 2 300 43 10 50 6 474 44 12 460 $4 2 27 0 4010 46 24 4 29 50 6 42 4 402 430 51 254 252 23 0 36 10 42 8 46 6 38 4 362 390 47 264 21 2 19 0 3210 38 8 42 634 4 32 2 350 43 27 4 17 2 450 29 10 34 8 386 20 4 282 32 0 40 284 13 2 0 25 10 31 8 346 26 4 24 2 28 0 36, 29 4 8 2 8 0 21 10 27 8 306 22 4 20 2 24 0 33 o 18 10 23 8 26 6 17 4 162 21 O 29 lo 14 8 22 14 122 17

9

I

53
8 58
8 54

8

30 4 4

O

5 443 421 48
5 40 3 38 1 45
5 36 3 34

1.41

3 30137 3 26 1 34. 3 231 30 9 29 7,245 20 3 19 27 9 257 205 163 TS 123 921 7 16 5 12 3 11 I 19 9 17 75 83 81 16 9 137 7 5 4 3 41 12 9 97 35 0301 9 9 56 594 56 2 5715

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

11 45 945

11.41

1 37

11 34

11 30
11 26
11 22
11 19
1115 9
1. 1. 9

1 7
9 4
0
11 4
9

II O 8 56

10 56

8

52

8

10 52
to 48
10 44
10 41
10 37
831
8 26 16
10 33

48
8 44
8
39
835

10 29

9 4 7 34

9 377 3

9 33
9 29 7

9 25
9
16
9
12

[ocr errors][merged small][merged small][ocr errors][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][ocr errors][merged small][merged small][ocr errors][ocr errors][merged small][merged small]
[blocks in formation]

28 20 29 12

N. 21 20 510 510 1811 54 20 13 23 22 19 52 10 290.42 12 14 20 25 23 27 20 17 11 231 19 38 10 81 5 12 34 20 36 23 27 20 2419 24 9 461 29 12 54 20 48 23 25 19 10 9 24 1 52 13 14 20 5823 26 18 55 9 12 16 13 33 21 9 23 27 18 40 8 392 39113 52 21 19 23 28 18 25 8 163 314 11/21 29 23 29/18 97 543 26 14 30 21 38 23 30 17 53 3 4914 48 21 48 23 14 131 121 561

3117 36)

70 46 0

3 14 14 29 21 51

3

37 14 48 22 00

10 16 35 33 16

5

511
26 19 5311
25 19 40 10
23 19 27 10 24 1
21 19 1310 31
18 19 09 42 2
158 46 9 21 2
11 18 31 8 59 2
118 16.8 38.

4

4

4 47 15

N.

23 13 44 2 37

8

13 13

25 2 14

9

213 61 50 9
461

26 1

015 722 9

23 13 26 22 17

44 22 25

6

5 56 16
1916

38 22 45
55 22 51

6 42 17 12 22 57

8

7 4 17 29 23 2

7

27 17 45 23 7

7

49 18 123 11

8

2710

4 10

2 22 32 20 22 39

12 18 17 23 15

34 18 33 23 18

S.

45 19 5823 28
620 11 23 28
28 20 24 23 27
49 20 36 23 26
9 20 48 23 25

40 10
17 11
260 611
60 30 11
450 53 12
17 12 30 21
40 12 50 21
4 13 11 21 21 23 17
27 13 31 21 3223 14
50 13 50 21 4223 10

023 23

11 23 20

14 101

123 6

5618 48 23 21

18 19

3 23 23

40 19 17 23 25
219 31 23 26

24 19 45 23 27

EXPLANATION AND USE OF THIS TABLE.

The Declination of the Sun is an arch of a meridian contained. between its centre and the equinoctial, which arch is reckoned in degrees, minutes, &c.

In the first quadrant of the ecliptic, from about the 21st of March, to the 21st of June, the Sun's declination is North, and, increasing and in the third quadrant, between the 22d of Sep tember and 21st of December, the Sun's declination is South, and increasing In the second quadrant of the ecliptic, from about the 21st of June to the 22d of September, the Sun's declination is North, and decreasing; and in the fourth quadrant, between the 21st of December and the 21st of March, the Sun's declination is South, and decreasing; which will be readily perceived by inspecting the table.

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

In this table, the Sun's declination is given, from the year 1808 925 inclusive, calculated for the instant of noon, each day, at

at sea

quisite

the in

ing th

place

at the

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

622 31 15 395 456 24 16 30

97 54 17 35 23

22

7 22 24 15 20 5 19 6 47 15 46,22 45 822 16 15 14 557 917 3 22 51 922 814 424 327 32 17 19 23 55 22 1021 59 14 234 1121 50 14 33 41 12 21 40 13 433 21 1321 30 13 232 58 1421 20 13 32 34 1521 912 422 11

10 17 8 38 18

8

12

23 517 50 18230

9

9

51.23 6 23 018 21 23 22 18 35 23 9 4318 50)23 1620 5812 221 4710 519 4 23 1720 46 12 11 23 10 26 19 18 23 18 20 34 11 400 59 10 47 19 31 23 19 20 22 11 180 36 11 819 4 23 20 20 9 10 570 1:11 28 19 57 23

S.

N.

21 19 56

10 350 12/11 49120 10 23 28 20
22 19 42 10 13 0 35 12 920 22 23 28 20
23 19 28 9 520 59 12 29120 33 23 27 20
24 19 14 9 291 23/12 49120 45 23
25 18 59 9 71 4613 920 36 23

25 19
25 19

26 18 448 45 2 10 13 28 21 623
27 18 29
8 222 33 13 47 25 17 23
28 18 13 8 02 5714 611 27 23
3 2014 2521 36 23
3 43 14 44 21 45 23

29 17 57 30 17 411 131117 241

4 7

54

68 22 2

[ocr errors]
[ocr errors]
[ocr errors]

5 22 2015
9 22 15 34 15 =
13/2 53 16 4513 27 43 97
16 24 414
3 29 8 6 18
19/21 05114 B
£8 28 18

[ocr errors]

3 558 952735

[ocr errors]

$23

29

[ocr errors]

23

22 21 25 13 492 47 € 50
24 25 26 13 33 2098 59 23 23
25 21 513 11 5 9 35 19 33 23 25
20 55 12 523 33 9 55.19 27123
20 44 12 321 1010 18:19 4123
N.

S

32 12 120 47 10 45 19 55 23 25 2111 52 2311 1/2008 25 28 911 520 041 2220 21 25 27 5631 1 2411 43 20 33 23 26 44 12 532 47 12 20 45 23 23 25 23 19 30 10 30 1 1 12 2520 57 23 21 39 17 15 91 412 45 21 823 19 19 3 9 48 157|13 521 19:23 18 16 18 49 9 27 2 21 13 2521 29:23 15 18 35 9 52 4413 45 21 39 23 11 118 211 8 441 14 5 23

the Meridian of Greenwich, or the meridian, at which we begin to reckon the Longitude. It is to be taken out with the month at the top, and the day in the left hand column, at the same time, noting whether it be North, or South, as expressed at the top of each column. The declination being here given to the nearest minute, it will be found sufficiently exact for the most common and useful problems, wherein it is concerned.

The sun's declination is necessary to find the latitude, whether at sea or land, from the meridian altitude observed; it is also requisite for finding the latitude from two altitudes observed with the interval of time measured by a watch; it serves for comput ing the sun's azimuth, having his altitude and the latitude of the place given, in order to find the variation of the compass; it is required, jointly with the latitude of the place and the sun's horary angle, to compute his altitude, if neglected to be observed at the time of taking the moon's distance from the sun for findin the longitude, being useful to facilitate the calculation of the efft

« ΠροηγούμενηΣυνέχεια »