The ECLIPSES, 1758. By Mr. John Thorpe, School mafter at Woodborough, from Manufcript and alfo from Mr. Street's Tables. F fix Eclipfes that will happen this Year, only one O will be visible in England. They happen as follows, viz. The firft is a fmall Eclipfe of the Sun, on the 9th of January, about a quarter past 6 at Night. Invisible. The fecond, is of the Moon, on January the 24th in the Morning, total and (part) vifible; the Calculation of which for LONDON, take as follows. Equal Time of the Orbit 8, January 23. 18. 40. 46. 23. 18. 30. 16. Equation of Time add 12. 45. 12. 45. 23. 18. 53. 31.23. 18. 43. S. 0. S. O. ΟΙ N O2 6. 24. 46. 10. 6. 25. 23. 57. Whence the Time of Red. add & sub. Apparent Time of the Ecliptic 8 2 Middle 5.11. 14. O. 23. 10. 4. 20. 15. 10. 4. 17. 38. 4. 17. 38. 8. 47. 8. 51. 2. 2. 54. 12. 53 6. O add IO. Their Sum 54. 22. 15. 53. 21. Semidiameter of fub. Rem, the Semidiam. of Shadow Semidiameter of Dadd Sum of Semid. of D and Shadow 52. 51. Lat. of North afcending, fub. 5 I. 32. Rem. the Part deficient 52. 46. 50. 46. 21. 12 As Semid. of): 6 Digits :: Part def.: to Digits Ec. 21. 3. For the Scruples of Incidence, &c. I fhall only inftance in one of them, which fhall be Street's, the other being obtained after the fame Manner, thus, Sum of the Semidiam. of D and in Seconds The D Latitude add & fub. Half 3.504018 Log, of the Scruples of Incidence 2192. B For the Time of Incidence, thus As hourly Motion of 》 from :6 :: Scru-2 h. h. '. ". ples of Incidence: Time. S 1. 58. 52 I. 57. 38. The Time of Incidence being fub. and added from and to the Middle, gives the Time of Beginning and End of the general Eclipfe. The Scruples and Time of total Darkness may be obtained after the fame Manner, only instead of the Sum of the Semidiameter of D and Shadow, take their Diff. and the Time of total Darkness will be found. 52′ 3′′-50′ 23′′. From the foregoing Calculation may be deduced The apparent Time of the beginning at h. London, 1758, January 24 Morn. Beginning of total Darkness Greatest Obfcuration h. at 4. 54. 34. 6. I. 23. 4. 45. 19. 5. 52. 34. 6. 53. 26. 6. 42. 57. 6. 53. 36. 6. 43. 5. 7.45. 29. 7. 33. 20. 8. 52. 18. 8. 40. 35. 3. 57. 44. 210. 3. 3. 55. 16. 210. 12. End of the Eclipse Whole Duration Digits eclipfed Note, The Moon fets that Morning about 37 min. paft 7; which will be about the Time it begins to emerge out of total Darkness. In this Type, The large dark Circle reprefents a Section of the Earth's Shadow. AB, a Portion of the Ecliptic; CD, is the Moon's Way; a the Centre of the Moon at the Beginning, b, at the End, &c. The third Eclipfe is of the Sun, on the 8th of February, at · 3 quarters paft Four in the Morning. The fourth is also a folar Eclipfe, on July 5, about 45 min. paft 8 in the Morning; nearly 4 Hours after Sun-rifing; yet the Moon having great South Latitude, which being increased by her Parallax, will deprefs her below the Sun's Limb, and thereby render the Eclipfe invifible to us in England; but may be seen in the more fouthern Parts of the Earth, where the Pårallax is small, about the Levant, and near the Tropic. The 5th is a Lunar Eclipfe on July 20th, 3 Quarters paft 4, in the Afternoon, invifible. The 6th and laft is of the Sun, on the 30th of December, at half an Hour paft 7, in the Morning. invifible. Careless Careless Jack of Cambridge, has alfo favoured us with the Calculation of the fame Eclipfe, from Mr. Flamstead's and Mr. Dunthorn's Tables. We received the following from Mr. Tho. Ailen of Spalding, By examining the ecliptic Boundaries, &c. I find only one vifible Eclipfe in the Year 1758, and that a Lunar one; the Time, &c. whereof I have carefully computed by Dr. Halley's Tables, for the Meridian of the royal Obfervatory at Greenwich, as follows. ! Beginning of the Eclipfe Beginning of total Darkness Middle Ecliptic Oppofition End of total Darkness End of the Eclipfe Duration of total Darkness Duration of the Eclipfe Digits eclipfed D. h. 24. 4. 30. 9. 5. 35. 26. 6. 26. 48. 6. 26. 58. 7. 18. 10. 8. 23. 27 I. 42. 44. 3. 53. 18. 21°. 7. In the Morning at the ROYAL OBSERVATORY Apparent Time, at Greenwich. N. B. Mr. Waddington obferves that this Eclipfe will be visible to of the Earth's Surfacc. Mr. Sam. Towndrow of Chesterfield, in Derbyshire, fent us the following Calculation from Leadbetter's Tables; for Jan. 23. end. beg.tot. Dark end totDark 20h 30' 18" 17h 23' 13" 19h 38′ 55′′ 43 4 15 42 18 12 35 13 14 00 55 6420 5 1816 58 13 19 14 55 Chesterfield 16 22 50 18 22 4 20 21 18 17 14 13 19 25 55 Lifbon 15 54 50 17 Barbadoes 12 38 50 14 38 4 54 4 19 53 18 16 46 13 19 I 55 13 45 55 Durat. 3 58 28 Duration of total Dark. 2 15 42 Digits Ecl. 20:25 3. A Catalogue of all the Enigmas hitherto published in the GENT'S DIARY. 1741. I. HEMP, Richard Archibald. 2. The Year FORTY, William D. 3. TOBACCO-PIPE, Rich. Peat. 4. SEWING-NEEDLE, G 1742. (1) 5. A SHADOW, R. Ceftrienfis. (2) 6. An OYSTER, W. Durant. (3) 7. ENDYMION, Abr. Lord. (4) 8. INNOCENCE, R. Ceftrienfis. (5) 9 A SPIDER, Will. Chapple. (6) 10. A PAIR OF SHOES,Ceftrien. (7) 11. SEWING-NEEDLE, J. Dew 1743, (4) 23. AnENIGMA,W.Wallhead. (5) 24. Letter A, Sam. Bamfield. (6) 25. A TOPP, James Hall. (7) 26. ACHIMNEY, Rebecca May (8) 27. A PLOUGH, W. Holliday. 1746. (1) 28. A FRANK'D LETTER,W.C (2) 29. A PEN, Rich. Whitehouse (3) 30. A DREAM, Sam. Bamfield (4) 31. LovE, Samuel Hammond. (5) 32, ACE OF TRUMPS, J. Hall. (6) 33. AWOMAN'SBUSK, R. Hulfe (7) 34. AMAN'S BEARD, W. Mobbs (8) 35. AFISH-HOOK,R. Matlock (9) 36. SHOEMAKER'S LAST, 1747. [J. Calvert. (1) 37. The GOUT, Ralph Hulfe. (2) 38. FLAX, Mama's Joye. (3) 39. A GIMLET, James Hall, (4) 40. A GUINEA, S. Hammond. (5) 41. A CLOUD, Sam. Bamfield. (6) 42. HEALTH, Anthony Moor. (7) 43. GRINDINGSTONE, C. M. (8) 44 DREDGING-BOX, W.Heaford 1748. (1) 45. LIGHT, Sam. Bamfield. (2) 46. YAWNING, Chagford. Hill (3) 47. NON (3) 47. NONSENSE, Anth. Moor. (1) 52. SILENCE, S. Hammond. (1) 62. BELLows, S. Hammond. (4) 86. A BLANK, S. Hammond.. (1) 89. A LIE, S. Hammond. (1) 97. CRICKET-BALL,C. Mafon (3) 64. WEATHERCOCK, F. T.M,(7) 103. THOUGHT, W. Davis. (5) 66. CONTENT, Ralph Hulse. (1) 69. NOISE, Thomas Peat. (1) 77. NOSE, John Pickburn. (1) 83. HAPPINESS, Somebody. (8) 104. An HOUR-GLASS, C. M.: (1) 107, Letter G, Tho. Pooke. (1) 115. A THUMB, Random, Jun, ANSWERS to the QUESTIONS in the last Year's DIARY. 1. Question (161) anfwered by Mr. Will. Kingfton of Bath Let 2 s2=x+z; 2d =x—x •.• x=s2+d2; and z=s2-d2; 2 4 1 2 2 1 14.02. 2 |