Lat. and the Time of its rifing, when the Latitude and Declination are of different Names. I 2 3 4 16.006.00!6.00 6.00 91 6 8 DEGREES OF DECLINATION, 12 13 14 15 16 17 22 23123.281 23 6 6 6.. Lat. A TABLE fhewing the Time of the Sun, Moon, and Star's fetting, when the Latitude and Declination are of the fame Name; and the Time of its rifing, when the Latitude and Declination are of different Names. I 2 3 4 5 6 8 DEGREES OF DECLINATION. 9 ΤΟ 21 Lat. 7.04 7.05 33 39 I 2 13 14 15 40 42 52 53 52 5.00 6.056.106.155.21 6.26 6.31 6.36 6.41 6.47 6.52 6.58 7.037.09 7.14 7.20 7.26 7.32 7.38 7.45 7-51 7.58 3.05 8.128.15 57 Tt To find the Time of the Sun's Rifing, Setting, and the Length of the Day and Night, by this Table. Firft. Find the fun's declination at the top of the page (marked with the degrees of declination) and the latitudes in the right or left hand columns (marked lat.) and in the common angle of meeting is the time of fun fetting, if the fun has north declination, but the time of fun rising, if the fun has south declination. EXAMPLE I. Let it be required to find the time of the fun's rifing and setting, with the length of the day and night, in lat. 51° north, the 26th day of May, 1809? I first feek the fun's declination for the given day, and find it 21o 6′ N. them under the declination 21, and against the latitude 518, ftands 7 H. 53 M. the time the fun fets on the given day, in lat. 51 north, which being doubled, gives 15 H. 46 M. the length of the day; and if 7 H. 53 M. the time of the fun fetting, be fubtracted from 12 H. the remainder 4 H. 7 M. gives the time of the fun's rifing, which being doubled, gives 8 H. 14 M. length of the night. But, when the fun has 21° fouth declination in this latitude, the time of funfetting becomes the time of fun-rifing, and the length of the day will then become the length of the night. Thus, on the 26th of November, 1809, the fun's declination will be 20° 57′ or 21° S. then the time of fun-rifing is 7 H. 53 M. his fetting 4 H. 7 M. and the length of the night 15 H. 46 M. and day 8 H. 14 M. EXAMPLE II. EXAMPLE III. Let it be required to find the time of the Required the time of the fun's rifing and fun's rifing, fetting, and length of the day and setting, and length of day at the Cape of Good night, at Petersburg, the 21st June, 1809. Hope, in lat. 34. 29 S. May 16th, 1809. Under the declination 19° 4' or 19° N. Under 23° 28′ N. the declination that day, and against 60° N. the latitude of Peters-and against the lat. 34 S. burg, Stands the fun's fetting The time of fun-rifing 12 Stands the fun's rifing 9 15 Time of fun's setting 2 45 12 654 5 6 2 10 12 Sun-fetting doubled is the length of day 18 30 The length of the day To find the Rifing and Setting of the Stars. By this table the rifing and fetting of any star may be found, whofe declination does not exceed 21° 28′ north or fouth, in the following manner: If you are in north lat. and the ftar has north declination, look for the declination at the top, and the lat. in the right or left hand columns, in the angle of meeting, is half the time of the star's continuance above the horizon, in that lat. or the time it takes in afcending from the eastern fide of the horizon to the meridian, and defcending from the meridian to the western part of the horizon. Eherefore, if thefe hours and minutes be fubtracted from the time of the ftar's coming to the meridian, the remainder will be the time of the star's rifing, and if added, the fum will be the time of the ftar's fetting. EXAMPLE I. Required when the ftar Arcturus rifes and fets December 1, in lat. 51 deg. N. The time of the ftar's coming to the meridian, or fouthing in the morning 9 39 Then under star's declination 20° 11′ 50′′ N. and againit lat. Time of star's rifing in the morning Added, gives the time of the star's setting 51 ftands 747 152 17 £6 Star fets 26 minutes after 5 in the evening 525 When the latitude is north, and the ftar has fouth declination, or the latitude fouth and the ftar has north declination, find the latitude in the fide columns as before, against which, and under the degrees of declination, stands half the time the star is under the horizon, which being fubtracted from 12, the remainder will be half the time the star will be above the horizon in that latitude. Example. What time will the Dog Star, Sirius, rife and fet at London, January 25? 12 726 434 10 05 under the declination 16° 27′ S. and against lat. 51° 32′ or 52o stands 2 39 In like manner may the rifing and fetting of the planets be found when their declination does not exceed 239, and the time of their paffage over the meridian is known. Suppofe it were required to know the time of Jupiter's rifing and setting, in latitude 52 north the 1ft of November, 1807. In the Nautical Almanack for 1807, I find that Jupiter passes over the meridian of Greenwich at 6 H. 3 M. and his declination is 20° o' S. Now, 12 H. added to 6 H. 3 M. is 18 H. 3 M. from which fubtract 12 H. and the remainder 6 H. 3 M. is the time of his paffing the meridian in the morning of that day, according to the civil account. Under declination 20° and against latitude 52° ftand 7 H. 51 M. half the time Jupiter is below the horizon; this doubled is 15 H. 42 M. the length of Jupiter's night, which subtracted from 24 H. gives & H. 18 M. the length of his day. Again, 7 H. 51 M. added to his paffing the meridian 6 H. 3 M. gives 13 H. 54 M. or H. 54 M. the time of his rifing in the morning, and 6 H. 3 M. added to 12 H. gives 18 H. 3 M. from this fum take 7 H. 5 M. and the remainder 10 H. 12 M. is the time of his fetting in the morning. Suppofe it were required to find the moon's rifing and setting October 18th 1806, in latitude 2° north. In the Nautical Almanack, (page 6th) I find that the moon paffes the meridian. of Greenwich at 5 H. 40 M. in the evening, and her declination at midnight is 19° 29' South. Then in the Tables, under the declination 19° 29′ S. and against the lat. 52°, ftands 7 H. 47 M. Half the time the is under the horizon doubled is 15 H. 34 M. the length of the lunar night, which fubtractod from 24 H. leaves 8H. 26 M. the lunar day. To the moon's fouthing or paffage over the meridian, 5 H. 40 M. add half the lunar day, 4 H. 3 M. gives 9 H. 53 M. her fetting at midnight, and from 5 H. 40 M. take 4,13, the remainder 1 H. 9 M. is the time of her riling in the afternoon. In like manner may be found the rifing and fetting of the other planets, only oblerving that the noon of the common day, and end of the fea day, is the beginning of the day in the Nautical Almanack. As all the calculations here are made for the meridian of London, or Greenwich, care must be taken to reduce the time of their passages over the meridian of Greenwich to the meridian of the place of obfervation, by allowing 1 H. later for every 15% of welt !cngitude, and i H. fooner for every 15° of east Longitude. It were to be wished, that gentlemen belonging to the fea would carry a celeftial globe with them, upon which all the above may be found in an ealy manner; for they would have nothing more to do but to fet the globe north and fouth, raife the pole as many degrees above the horizon as the latitude is; bring the fun's place to the brazen meridian, and fet the index to the upper 12; then turn the globe round, and note what ftars come to the meridian, and the hour index will point to the time; when they come above the horizon, it will point to the time of their riding, and when they defcend below the horizon, it will point to their fet. ting; for as each star on the globe will point directly to one of the fame name in the heavens, they may be viewed at any time of the night; or, if a planet, turn the globe until the index points to the time of their paffage over the meridian, and make a mark on the globe with a pencil, under their declination, then turn the globe eaft until the mark comes to the horizon, and the index will point to the time of their rifing; and turned wefterly till it come to the horizon, the index will point to the time of their setting. Tta Proportion of Powder for Sea Ser- Salut- Scal- lb. oz.lb. oz. lb. oz. lb. oz. 42 25. C14. 10. 0 3. O 32 21. 10.11 8.0 2.12 24 18. o 8. o 6. c 2. o 15. 06. 04. 81. 8 12. 04. 03. 01. a 9. 이 3. O 2. 4 O. 12 18 12 2 6. C 2. 2. O 4. 0 I. C 0. 81 0.3 0. 1900 | | 57. 7 Caronades. 2000|| 59. 2100 60. 32 24 02. 18 11. 07 420 27. 11 19 5. 2015. 216. 77 110 92115 06 120 2216. 23/6. 21125 34130 35 7. 36 7. 83230 94/240 37 8. 05250 38 8. 39 8. 40 8. 41 8. 42 8. 4318. 19. C 2 N.B Thele proportions are 3with powder in good condition; 4it it is damp, or damaged, a great5er quantity will be neceffary. 6 ( A TABLE of the Number and forts of Shot contained in the Grapes for the nature of Guns undermentioned, No. in No, in 20. 0682037. 88 440087. 8 Pdrs. Shot. each. each box 20. 92860 38. 80 4600 89. |