SUN's RIGHT ASCENSION.

Days. Jan. Feb. Mar. April. May. June July. Aug. Sept. Oct. Nov. Dec.. Days.

H. MH. M.H. M.H. M.H. M.H. M.A. M.H. M.H. M.H. M. H. M.H. M.

This Table is fufficiently exact for finding when any Star comes to the Meridian, in order to obtain the Latitude; but in all calculations for determining the true Apparent Time, the Sun's Right Afcenfion muft be taken out of the Nautical Almanack, as it is there calculated to a greater degree of accuracy. If the Sun's Right Afcenfion be wanted in Degrees,it is readily found by converting Time into Degrees, by means of Table XVI.

The Right Afcenfions and Declinations of the principal fixec
Stars, adapted to the Beginning of the Year 1806.

3.24

86 10

FOMALHAUT..

6 19 39

6 36 35
9 18 2

16 17 31
22 46 53

3.85 110 33 Q

3 14 112 17
3 69 113 21 15

3.24 131 57 45
3.20 149 30 15
3.71 162 30' 45
3.82 162 54 45
2.69191 23 15
2.39 204 58 15
2.72 211 42
2 63 221 32
2. 53 231 37
2 73 256 27
2 77 261 29 O
1.39 268 I 45
2.03 277 35 30
292 295, 20 30
2.03 308 42 15
I 44 318 29 O
2.87 343 35 45
2.96 343 46 45
2.25
22 36 45
287

1933

76 18 15 94 54 45 2.65 99 8 45 2.93 139 30 30 3.14 198 44 45 3 2220 230 3 22 226 39 3.64 244 22 45 3-33341 43 15

If the places of thefe ftars are wanted for any time before the beginning of the year 1806, multiply the annual variation, both in right afcenfion and declination, by the number of years before 1806, and fubtract the product from the right afcenfion ftanding in the table; but the product of the annual variation in declination must be added to, or fubtracted from the declination, with a contrary fign; but for any year after 1806, the variation in right afcenfion must be added to the right afcenfion in this table, and the vari ation in declination muft either be added to, or fubtracted from it, according as their figns are, to fit the declination to any fucceeding year. The annual variation is fet down for feconds, and decimals of a fecond. The ftars in the preceding table will be found to correfpond with thofe whofe names are marked in the

7 5

79

-13.30

For turning Degrees and Minutes into Time, and the contrary D MM

ΩΣ

HMDH M DHMM SSec.

MS M M S M M S M M S T Thi.

8. 41 [୪] 12. L 24116. 4 30120,

62 4.

122

8.8 182 12.

24215 8

24316.1

30% 20.1.

24416.

15 1 30

3

3< 0.16

245/16.2

30 20.20

8.24 186 (2.24

67 4.28

8.28

127

189 12.30

24, 16.3

300 20 30
3120,40

2

2 1

2 3

90 6.24 156 10.24 216 14.24
976.28 157
10.28
986.32 158 10.32
99 6.36 159 10.36
TOO 16.40 160 10.40

382.321
3912.30
40 2.4-
412.441 101 6,44 161
42/2.4 102 6.45 162 10.48 222 14.48 28218 48
4312.52 103 6.5 163 10.52 223 14:52
44 2.56 104 6.50 164 10.56|| 224 14.56

218 14.34
278 18.32
2194-36 27918 3.
220 14.40 280 8. 40
10.44 221 1.4428118.44

939

28719.8 34723.1 45 47 228 15.12 28819.12 348 23.1212 048 229 15.16 289|19.16|| 349|23.1 .2 15 49 230: 15.20 290 10 20 III 7.241 231 15:229119.24 112 7.2 172 11.28 232 15.28 29219 28 1137.32 173 11.32 233 15.32 29319.32 543.3 11417.36 174 11.36 234 15.30 29419.36 553.40 1157 40 175 II.4 235 15.40 29519.40 563.44 116 7.4- 176 11.44 236 15.44 26 19.44 573.43 1717.45 177 11.48 237 15.48 29719.48 | 583.52 118 7.52 178 1.52 238 15.52 59 3.56 119 7 56 179 11.56 239 15 56 6014. o 120'8. 130 12.0 240 0

42 44 46 48° | 50° | 52′

To reduce the time of the Moon's Paffage over the Meridian of Greenwich to the Time of its Paffage over any other Meridian,

Ship's

Long 40

Daily Va iation of the Moon's paffing the Meridian.

Time

from)

175 19

20

25 26 27 28

180 20 21

222222

25

26

126

~ 2 2

596

25

26

56

27

27

70

26 27 28 28
27 28 28 29
27 28. 29
28 29

10 20

10 40

30

II O

30

II 20

40

21 22 23 24 22 23 24 25 26 27 28 29 30 31 32. 33 12 O 42′ 44′ 46′ 48′ | 50′ | 52 | 54′ 56′ 58° 60° 62 64 66' TABLE XVIII contains the decimals to every minute in twelve hours, and is ufeful to find the proportion of time in twelve hours, by multiplying it by the number found under the top hours in the column, and oppofite to the minute in the left hand fide column; from the product cut off four figures from the right hand, the remainder is the proportion of time required, if there is no fraction.

EXAMPLE. If the difference in 12 hours is 6 minutes, what will it be in 6 hours?

If the difference is for a proportion of time in 24 hours, multiply the difference by the decinial of half the time required; from the podu&t cut

Decimals to every Minute in Twelve Hours.

O I 2 3 4 5 6 17 18 9.

10

0833.1667.2500.3333 4167.5000.5833 6667-7500.8333 9167 0013-0846. 1680 2513.33404180.5013.5846 6680.7513-8346.9180 2.0028.0861.1695.2528.3361.4195-5028 5861 6695 7528.8301 1.9195 3.0042.0875.1709.2542.3375.4209.5042.5875: 6709-7542.8375.9206 5.0069.0902.1736.2569.3402-4236.5069.5902.6736 7569.8402-9236

4.0055.0888.1722-2555-3388.4222.5055.5888.6722.7555.8385-9222

II

12

6.00830916.1750.2583.3416.42505083.5916.67507583.8416.9250 0097.0930.17642597-343042641-50971-5930.67647597.8430.9204 8.0III 0944.1778.2611.3444 4278 5111.5944-6778.7613 8444 9278 9.0125 0958.1792.2625.3458.4292.5125.5958.6792.7625 8458.9292 10.0139.0972.1806.2639-3472 4306 51395972.6800.7639-8472.9306 0152.0985.1819.2652.3485.4319.5151 5985.6819 7652-8485-9319 0167 1000. 1834 2667 3500 4334-5167.6000.6834 7667.85009334 13.0181. 1014. 1848.2681.3514.4348 5181.6014.6348-7681.8514.9348 14 0194 .1027. 1861.2694.3527.4361 5194 6027 6861 7694 8527 9361 1041.1875.2708.3541-43755218.60411.6875.77085449375. 16.0222.1055.1889.2722-3555.4389-5222.6055.6889.7722.8555 4389 17.C236.1069.1903 2736 3569-44035236.6069.6903-730.8569.0403 18025010831917-2750 3553.4417 5250.6083 6917.7750.8583 9417 19.0264. 1097.1931-27643597.443-1.5264.6097 6931.7764.8597 5431 20.0278.1111.1945-2778 3611.4445-5278-6111.6945-7778.8611.9445 21.02921125-1959.2792.3625 4459 5292.6125.69597792.8625.9459 22.03061139.1973.2806.3639.44735306.6139.6973.7806.8639.9473 23.0319.152.1986.2819.3652-4486-5319 6152.6986.7819.8652.9486

15.0208

.

24.0333 1166.2000.28333666.4500.5333.61667000.7833.8666.9500 25.0347.1180.2014 2847-368.45145347.6180.7014.7847.8680

•9514

25.0361.1194.2028.2861.3694.4:28.5361 61947028.7861.6694.9528 27.0375.12082042.2875.3708:4542-5375-6208.7042.7875.8708.9542 28.0389.1222.2056 2889.3722 4556.5389 6222.7056.7889.8722.9555 29.0403.1236 2070.2903.3736-4570.5403.6236 7070-7903.846.9570 30.0417.12502084.2917.3750-4584 517 62507084-7917.8750.9584 31.0431.1264.2098.2931.3764-4598 5431.6264.70987931-87641.9598 32.04441277.2111.2944.3777-4611 5444.6277.71117944 8777.9611 3304581291.2125.2958.3791.4625.5458.6291.71257958-8791.9625 3404721305.2139.2972.3805.4639.5472 6305 7139.7972.8805 9639 35.0436 1319.2153.2986.3819.4653.5486.6319.7153 7986.8819.9653 36.05001333.2167.3000.3833.4667.550063337167.8000.8833.9667

37.0514-1347-21811.30143847 46811.5514.6347-7181 8014.8847.9681 38.0528.1361.2195.3028.3861 4695.5528.6361.7195.8028.88611.9695 39-05421375 2209.3042.3875 4:09 5542 63757209 8042.8875.9709 40.0556 1389.2223.3056.3889 4723-5556.638.7223.80561.8889.9723 410569.1402.2236 3069 3902.4736-5569.6402 7236.8069 .89021-9736 420583.1416.2250.3083.3916.4750.5583.6416 7250.8083.8916.9750 430597 1430 22643097 3930 47645597 6430 7264.8097.8930.9764 44.0611 1444.2278.3111.3944.4778.5611.6444-7278.8111 8944 9778 45.0625-14582292:3125 3958 47925625 6458.7292.8125.8958.9792 4606391472-2306.3139-3972.4806.5639.6472.7306.8139.8972.9 06 4706531486.2320.3153.3986.4820.5653.6486.73208143.89861.820 48.0667.1500.2334.3167 4000 4834.5667.6500.7334.8167.9000 9834 49 0681 1514.2348.3181.40144848.5681.6514 7348 818190149848 500694 1527-2361.3194 4027 4861.5694-6327.7361.8194.9027.9261 51 0708.15412375.3208.4041 4875.5708.6541.7375.82081-9041.9875

52.07221555.2389 32224055.4889.5722.6555.7389 8222.9055.9889 53.07361569.2403 3236.4069.4903-5736.6569.7403.8236.9069.9903 54.07501583.2417 3250 4083.4917.5750.6583 7417.82501.9083.9917 55.0764 1597.2431.3264 4097-493-57646597-7431 8264.9097-9931 56.0778.1611.2445.3278.41114945.5778.6611.7445278| 9111.9945 57.0892 1625.2459-3392.4125-4959-5792.66257459.8292.9125.9959 58.0806.1639 2473-3306 4139 4973.5806.6639.7473.8306.9139.9973

.

59.0819:1652.2436.3319.4151.49861.5819.6652.7436.8319.9152.9986