True Apparent Places of Thirty-seven of the Principal Fixed Stars, for every tenth day of the year. Epoch.-The Upper Culmination at Greenwich. 16 55.1 44.86 54.64 54.7 44.68 54.5 17 54.46 54.2 44.50 54.7 27 54.30 53.6 44.31 54.6 Oct. 7 54.15 53.0 44.14 54.3 17 54.04 52.4 43.98 53.6 41.03 27 53.96 51.8 43.84 52.7 40.79 Nov. 6 53.93 51.2 43.74 16 53.96 50.7 43.69 26 54.05 50.4 43.67 54.19 50.2 43.71 54.38 50.3 43.80 51.0 42.26 50.0 41.77 47.2 42.04 51.3 41.65 47.9 14.22 56.6 14.12 57.5 41.79 52.2 41.50 48.3 13.9 58.2 52.7 41.34 48.6 13.2 58.7 41.16 49.6 13.65 58.9 51.5 40.58 49.8 40.31 40.42 43.8 37.3 40.15 42.5 51.89 50.9 44.11 39.S 40.321 34.0 40.52 41.1 40.93 48.1 13.31 58.5 13.15 58.0 45.7 40.56 13.02 57.2 12.92 56.2 43.2 True Apparent Places of Thirty-seven of the Principal Fixed Stars, for every tenth day of the year. Epoch. The Upper Culmination at Greenwich. Right Asc. .Dec. North. Right Asc. Dec. South. 61 1 " 49.45 55 50.5 49.25 47.9 6.14 31.7 49.09 38.3 h. m. 21 57 h. m. h. m. 20 6.29 29.1 Mar. 1 6.50 26.7 11 6.74 21.8 49.21 35.2 46.46 29.4 1.09. 48.3 T 59.87 5.8 83 Dr. Young's Refractions, the Barometer being at 30 inches, and the internal Thermometer at 50, or the external at 47, degrees; with the corrections for one inch in the barometer, and for - one degree in the thermometer of Fahrenheit. From page 19 of Vol. 1st of Pearson's Practical 50 12.16 25 55 12. 325 50 25.43 55 5,1 55 25. 3 53 4,9 1.024.25 52 4,7 4. 523.4 50 4,6 10:23.13 49 4,5 15 22.40 49 4,4 2022. 846 4,2 2521.37 45 | 4,0 30 21.7 44 3,9 35 20.33 43 3.8 40 20.10 42 3,6 45 19.43 403,5 50 19.17 39 3,4 55 18.52 393,3 2.015.20 38 3,2 518. 5 37 3,1 10 17.43 36 3,0 15/17.21 36 2,9 2017. 0 35 2,8 25 16.40 34 2,8 30 16.21 33 2,7 35 16. 2 33 2,7 40 15.43 32 2,6 45 15.25 32 2,5 5015. 8 31 2,4 5514.51 302,3 1,9 1,9 1,8 011.52 24,1 1,70 10 11.30 23,4 1,64 2011.10 22,7 1,58 30 10.50 22,0 1,53 40 10.32 21,3 1,48 50 10.15 20,7 1.43 5. 0 9.58 20,1 1,38 10 9.42 19,6 1,34) 20 9.27 19,1 1,30 30 9.11 18,6 1,26 40 8.58 19,1 1,22 50 8.45 17,6 1,19 6.0 8.3217,2 1,15 10 8.20 16,8 1,11| 20 8. 916,4 1,09 30 7.58 16,0 1,06 40 7.47 15,7 1,03 50 7.37 15,3 1,00 7. 0 7.27 15,0,98 10 7.17 14,6,95 20 7. 814,3,93 30 6.59 14,1,91| 40 6.51 13,9,89 50 6.43 13,5 ,87 40 6. 7 12,3,79 506. 0 12,1,77 9. 05.54 11,9,76 15. 03.34,3 7,18 1,439 105.47 11,7,71 30 3.27,3 6,95,424 205.41 11,5,73 16. 03.20,6 6,73,411 30 5.36 11,3,72 30 3.14,4 6,51,399 405.30 11,1,71 17. 03. 8,5 6,31,386 50 5.25 11,0 70 30 3. 2,9 6,12,374 10. 05.20 10,9,69 18. 0 2.57,6 5,94,362 105.15 10,6,67 19 2.47,7 5,61,340 The correction for an increase of altitude of one inch in the barometer, or for a depression of one degree in the thermometer, is to be added to the tabular refraction; but when the barometer is lower than 30 inches, or the thermometer higher than 47 degrees, the correction becomes subtractive. When great accuracy is required, 0,003 inch should be deducted from the observed height of the barometer, for each degree that the thermometer near it is above 50 degrees, and the same quantity added for an equal depression. Logarithm for converting Sidereal into Mean Solar Time + 9.9988126 Mean Solar into Sidereal Time + 0.0011874 แ 66 A second of time, at the Equator, contains 1521 feet. L METEOROLOGICAL TABLES FOR CAMBRIDGE, MASS. Summary of the Meteorological Observations made at the Observatory of Harvard College. By W. Cranch Bond. North Lat. 42° 22'. Lon. West of Greenwich, 71° 07'. From May 1st, 1842, to May 1st, 1843. May, June, 29.885 29.889 29.830 .059 29.529 29.858 43.4 53.5 60.249.6 51.68 29.928 29.945 29.907.038 29.940 29.925 54.4 63.3 72.8 59.9 62.60 July, 29.976 29.971 29.929.042 29.960 29.959 65.3 74.5 81.6 69.3 72.68 August, 30.059 30.066 30.032 .034 30.055 30.053 61.1 68.5 75.3 65.267.52 September, 29.971 29.990 29.923.067 29.963 29.962 51.1 59.0 67.4 55.3 58.201 October, 29.967 29.989 29.952 .037 29.979 29.972 39.9 48.6 58.6 45.3 48.10 November, 29.987 29.985 29.924 .061 29.972 29.967 30.1 34.4 42.0 32.9 34.85 December, 29.933 29.956 29.923.033 29.964 29.944 21.5 23.4 27.9 22.6 23.85 1843. January, February, March, April, Mean, 30.024 30.061 29.969 .092 29.932′29.996 24.9 28.3 35.5 29.7 29.60 29.841 29.858 29.819.039 29.883 29.850 11.7 14.2 24.3 16.5 16.47 29.814 29.817 29.745 .07229.798 29.793 18.5 26.4 33.4 24.625.72 29.933 29.949 29.904 .045 29.932 29.929 38.1 43.5 50.7 41.6 43.48 29.943 29.956 29.905.052 29.934 29.934 38.3 44.8 52.5 42.7 44.57 2. WINDS AND CLOUDS. |