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True Apparent Places of Thirty-seven of the Principal Fixed Stars, for every

tenth day of the year.
Epoch.- The Upper Culmination at Greenwich.

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Right Asc.

Dec. North.

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9.16

Apr. 1

20 36
44 21 14

21 57

1 22 49 30
1845.
sec.

sec.
1
вес

вес.
Jan. 1 8.14 43 58.2 51.16 55 67.8 49.33 3 69.0 4.36 26 34.3
11 8.09 55.5

50.96 65.1 49.29 68.7 4.26 33.9 21 8.09 52.6 50.84 62.1 49.27 69.5

4.19

33.2
31
0
8.15 49.3 50.78 59.0 49.28 70.1 4.14 32.2

o
Feb.10 8.26 46.5 50.82 55.4

49.31 70.6 4.12 31.0

o
20 8.42 43.8 50.94 52.3 49.39 71.1 4.14

29.5 Mar. 2 8.62

41.5
51.14 49.4 49.49 71.2 4.19 27.9

o
12 8.87 39.6 51.41 46.9

49.63 71.1

4.29

25.9
22
38.2 51.75 44.7 49.79 70.8

4.42

23.9 9.43

22 57 14
sec.
3.02 22 31.2
2.93 30.1
2.85 28.3
2.80 27.6
2.77 26.3
2.77

25.1 2.81 24.1 o

2.99 23.2 3.00 22.6 3.14 22.3 3.32 22.4 3.54 22.9 3.79 23.7 4.07 24.8 4.37 26.2 4.68

6.26

51.1

37.4 52.16 43.1 49.98 70.2 4.59 21.7 11 9,82 37.1 52.61 42.1 50.21 69.4

4.79

19.5 21 10.18 37.4

53.10 41.6 50.46 68.2 5.03 17.2 May 1

10,55 38.3 53.62 41.8 50.73 66.9 5.30 15.0
11 10.92 39.7 54.14

42.6
51.02 65.3 5.60

12.9
21 11.28 41.6 54-66 44.0 51.32 63,5 5.92 10.7
31 11.62 44.0

55.16
45.9
51.63 61.6

8.7 Jun. 10 11.93 46.7 55.62 48.3 51.93 59.7 6.60 7.0 201 12.21 49.7 56.03

52.22
57.8
6.95

5.5 30 12.45 53.0 56.39 54.2 52.50 55.9 7.28 4.3 July 10 12.63 56.3 56.69 57.6 52.75 54.0 7.59

3.4 20 12.76 59.7 56.89 61.1 52.96

52.4 7.87 2.8 30 12.84

57.03 64.8 53.13 50.8 8.12 2.6 Aug. 9 12.86 66.2 57.09 68.4 53.27 49.5

8.32

2.8 19 12.82 69.2 57.06 72.00 53.36

48.4 8.48

3.2 29 12.73 72.0 56.96 75.4 53.41 47.5

4.0 Sept. 8 12.59 74.6 56.79

78.6
53.41 46.8

8.65

5.0 18 12.40 76.7 56.55 81.5 53.38 46.3

8.66 6.2 28 12.18 78.5 56.25 84.1 53.31 46.1 8.63 7.5 Oct. 8 11.94 79.8 55.90 96.3 53.21

46.0 8.56

9.0 18 11.68 80.7 55.52 88.0 53.09 46.1 8.45 10.4 28. 11.41 81.1 55.12 89.2 52.96 46.4

11.7 Nov. 7 11.15 81.0 54.70 89.8 52.82 46.8

9.17

13.0 17 10.90 80.4 54.29 99.9 52.68 47.3

8.01

14.0 27 10.67 79.3 53.87 89.4 52,55 47.9 7.85 14.9 Dec. 7 10.47 77.7 53.49 88.4 52.43 48.6

7.69

15.5 17 10.31 75.7 53.15 86.8 52.32 49.4

7.54

15.8 27 10.19 73.3 52.85 84.7 52.24 50.2

7.41 15.8 37 10.12 70.7 52.62 82.2 52.181 51.01 7.30

15.6

27.9 4.99

29.9 5.30 32.0 5.60 34.2 5.88 36-5 6.14

38.8 6.36 41.0 6.55. 43-1 6.691 45.1

46.9 6.85 48-6 6.87

50-0 6.868 51.1 6.81 52.0 6.73 52.7 6.63

53.1 6.52 53.2 6-39

53.1 6.26 52-8 6.13 52-2 6.00

51.4 5.89 50-5 5.78 49.3

63.0

8.59

6.79

8.32

Dr. Young's Refractions, the Barometer being at 30 inches, and the inter

nal Thermometer at 50, or the external at 47, degrees; with the corrections for + one inch in the barometer, and for one degree in the ther. mometer of Fahrenheit. From page 19 of Vol. 1st of Pearson's Practical Astronomy.

App. Alt.
Refr. B. 30

Th. 50°
Diff. for
+1 B.
Diff. for
-1° Fa.

App. Alt.
Refr. B. 30

Th. 50°
Diff. for
+1 B.
Diff, for
-1° Fa.

App. Alt.

Refr. B. 30

Ther. 50°
Diff. for
+1B.
Diff. for
-1° Fa.

Diff, for -1° Fa.

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0.0 33.51 74 8,1 3. 014.35 30 2,3 8. 06.35 13,3 ,85 14. 03.49,9 7,70,469

532.53 71 7,6 514.19 29 2,2 10 6.20 13,1 ,53 10 3.47,1 7,61 ,464 10 31.58 69 7,3

10 14. 4 29 2,2 20.6.21 12,3,82 20 3.44,4 7,52,458 15 31. 5 67 7,0 15 13.50 28 2,1

306.14 12,6,80

30 3.41,8 7,43,453 2030.13 65 6,7 2013.35 23 2,1

406. 9 12,3 379 40 3.39,2 7,34 ,443 25 29.24 63 6,4 25 13.21 27 2,0 50 6. O 12,1 277 50 3.36,7 7,26,444 30 28.37 61 6,1 30 13. 727 2,0 9. 05.54 11,9,7615. 03.34,3 7,18,439 35 27.51 59 5,9 35 12.53 26 2,0

105.47 11,7 ,74 30 3.27,3 6,95,424 40 27. 6| 58 5,6 40 12.41 26 1,9 20 5.41 11,5 ,73 16. 03.20,6 6,73,411 45 26.24 56 5,4 45 12.28 25 1,9

305.36 11,3 ,72 30 3.14,4 6,51 ,399 50 25.43 55 5,1

50 12.16 25 1,9 40 5.30 11,1 ,71|17. 03. 8,5 6,31 ,386 5525. 3 53 4,9 55 12. 3 25 1,8

50 5.25 11,0 ,70 303. 2,9 6,12 ,374 1. 024.25 52 47 | 4. 011.52 24,1 1,70 10. 05.20 10,5 ,69 18. 0 2.57,6 5,94,362

523.43 50 4,6 10 11.30 23,4 1,64 105.15 10,6 ,67 19 2.47,7 5,61 ,340 10 23.13 49 4,5 2011.10 22,7 1,58

20 5.10 10,4 ,65 20 2.38,7 5,31,322 15 22.4048 4,4

30 10.50 22,0|1,53 305. 5 10,21,64 21 2.30,5 5,04 ,305 2022. 8 46 4,2 40 10.3221,3 1,48 40 5. O 10,1 ,63 22 2.23,2 4,79,290 2521.37 45 4,0 50 10.1520,7 1,43

50 4.56 9,9 ,62 23 2.16,5 4,57 ,276 30 21. 7 44 3,9 5. 09.58 20,1 1,33 11. 04.51

9,8 ,60 24 2.10,1 4,35 ,264 3520.38 43 3,8 10 9.42 19,6 1,34

10 4.47
9,6 ,59 25

2. 4,2 4,16 ,252 40 20.1042 3,6 20 9.27 19,1 1,30

204.43

9,5 ,58 26 1.53,3 3,97 ,241 45 19.43 40 3,5 30 9.11 18,6 1,26

30.4.39

9,4 ,57 27 1.53,8 3,81 ,230 50 19.17 39 3,4 40 8.58 18,1 1,22 40 4.35

9,2 ,56 28 1.49,1 3,65,219 55 18.52 39 3,3 50 8.4517,6 1,19

50 4.31

9,1 ,55 29 1.44,7 3,50 ,209 2. 0 18.29 38 3,2 6. 08.32 17,2 1,15 12. 04.23,1 9,00,556 | 30 1.40,5 3,36 ,201 5 18.5 37 3,1 10 8.20 16,8 1,11

10 4.24,4 8,86 ,548 | 31 1.36,6 3,23 ,193 10 17.43 36 3,0 20 8. 9 16,4 1,09

204.20,8 8,74,541 | 32 1.33,0 3,11,136 15 17.21 36 2,9 30 7.58 16,0 1,06

30 4.17,3 9,63,533 33 1.29,5 2,99 ,179 2017. 0 35 2,8 40 7.47 15,7 1,03 40 4.13,98,51,524 34 1.26,1 2,88 ,173 25 16.40 34 2,8 50 7.37 15,3 1,00

50 4.10,7 8,11 ,51735 1.23,0 2,78 1,167 30 16.21 33 2,7 7. 07.27 15,0,98 13. 04. 7,5 8,30 ,509 36 1.20,0 2,68 ,161 35 16. 233 2,7 10 7.17 14,6,95 10 4. 4,4 8,20 ,50337 1.17,1 2,53,155 40 15.43 32 2,6 20 7. 8 14,3 ,93

204. 1,4 8,10,496 38 1.14,4 2,49 ,149 4515.25 32 2,5 30 6.59 14,1 ,91

303.58,4 3,00 ,490 39 1.11,3 2,40 ,144 50 15. 8 31 2,4 40 6.51 13,8,89 40 3.55,57,39,432 40 1. 9,3 2,32 ,139 55 14.51 30 2,3 50 6.43 13,5 1,87 50 3.52,67,79,476|41 1. 6,9 2,24 1,134

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42 1. 4,62,16,130 55 40,8 1,36,082 67 24,7 ,83,050|| 79 11,2,38,023 43 1. 2,4 2,09 ,125 | 56 39,3 1,31,079 68 23,5 279,047|| 80 10,2 ,34,021 44 1. 0,32,02,120 57 37,8 1,26,076 69 22,4,75 ,045 | 81 9,2,31,018 45 58,11,95 ,116 58 36,4 1,22,073 70 21,2,71,043|| 32 8,2 ,27,016 46 56,1 1,98 ,11259 35,0 1,17,070 71 19,9,67,040 83 7,1 ,24 ,014 47 54,2 1,81 ,109 60 33,6 1.12,067|| 72 18,8,63,038|| 84 6,1 ,20,012 43 52,31,75 ,104 61 32,3 1,08 ,065 73 17,7,59,036 85 5,1 ,17,010 49 50,51,69,10162 31,0 1,04,062 74 16,6,56,033|| 86 4,1 ,14,008 50 48,81,63,097 63 29,7,99,060 75 15,5 ,52,031 87 3,1 ,10 ,006 51

47,1 1,58 ,094 64 28,4 ,95,057|| 76 14,4,48 ,029 88 2,0,07,004 52

45,4 1,52,090 65 27,2 ,91,055|| 77 13,4 ,45 ,027| 89 1,0,03 ,002 53 43,8 1,47,088 66 25,9 ,87,052 79 12,3,41 ,025 90 0,0,00,000 54

42,2/1,41 1,085|| 67 | 24,7 ,83 ,050| 79 11,2,38 1,023

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 thermome. ter near it is above 50 degrees, and the same quantity added for an equal depression.

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Logarithm for converting Sidereal into Mean Solar Time + 9.9988126

Mean Solar into Sidereal Time + 0.0011874 A second of time, at the Equator, contains 1521 feet.

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I. METEOROLOGICAL TABLES FOR CAMBRIDGE, Mass.
Summary of the Meteorological Observations made at the Observatory of Hara
vard College. By W. Cranch Bond. North Lat. 42° 22'. Lon. West of
Greenwich, 71° 071. From May 1st, 1843, to May 1st, 1844.

*

Monthly means of the Barometer,

Monthly means of the

External Thermometer, at the bourg.

at the hours. Mean

Means Sun- 9 3

9 for Month.

Sun- 9 3 9 for rise. A. M. P. M.

P. M. each rise. A.M.P.M. P.M. each month.

mo. 1843. May, 29.941 29 960 29.920.040 29.95629.944 46.8 56.1 64.6 50.5 54.5 June, 29.888 29.868 29.852.016 29.875 29.871 55.267.373.4 61.1 64.2 July,

29.919 29.919 29.876.043 29.908 29.905 61.171.2 78.765.8 69.2
August, 30.00729.99829.990.008 30.003 29.999 63.671.1 78.5 66.569.3
September, 30.047 30.043 30.010.033 30.033 30.033 54.2 61.069.2 57.9 60.6
October, 29.870 29.872 29.806.066 29.833 29.845 41.8 46.5 54.7 46.1 47.3
November, 30.034 30.041 29.987.054 29.960 30.005 29.6 34.240.9 32.6 34.3
December, 29.989 29.966 29.915.051 29.926 29.949 23.8 26.0 32.7 25.0 26.9

1844.
January, 29.948 29.895 29.891.004 29.976 29.928 10.7 14.421.215.1 15.3
February, 30.01530.00529.963.042 30.003 29.996 17.4 23.7 33.1 24.0 24.6
March, 29.982 30.012 30.005.00729.995 29.999 29.5 34.0 39.1 32.5 33.8
April, 30.168 30.154 30.097.057 30.120 30.135 39.5 49.1 60.2 44.8 48.4

Mean, 29.984 29.97829.943.035 29.966 29.968 39.446.2 53.9 43.5 45.8

2. WINDS AND CLOUDS.

Monthly means of the force of

the Wind, 0-6, at the hours.

Monthly means of Clouds,

0-10, at the hours.

4.4

3.9

1.3 1.2

1.0

4.1

Mean

Mean Am't of Sun- 9 3 9 for Sun- 9 3 9 for rain Month. rise. A.M.P. M. P. M. each rise. A M. P. M. P. M. each each mo.

mo. mo. 1843. May, 1.4 1.21.7 1.0 1.3 5.5

5.3

5.0 5.2.: 5.25 2.166 June, 1.4 1.1

1.6
1.1 1.3 4.2 3.7 5.7

4.50 5.377 July, 1.3 1.6 1.9

1.5 4.3 3.6

3.5 3.82 2.470 August, 1.1

1.6

1.2 6.6 6.2 5.0 5.0 5.70 8.740 September, 1.3 1.4 1.5 1.0 1.3 4.3

4.7 4.8 4.48 1.520 October,

1.3 1.4 1.6 1.1 1.4 5.3 4.9 5.5 4.6 5.07 5.814 November,/ 1.5 1.2 1.5

0.7 1.2 4.0 5.6 5.5 5.0 5.02 4.196 December, 1.3 1.2 1.4 1.3 1.3 6.3

7.3 6.3 6.62 3.344 1844. January, 1.4 1.4 1.7 1.5 1.5

4.8

4.2 4.0 4.40 4.294 February, 1.3

1.4 0.9 1.2 4.5 5.0 5.0 5.3 4.95 2.033 March, 1.6

1.8 1.2 1.5 6.1 5.9 7.3 7.0 6.58) 5.844 April,

1.1 1.3 1.4 1.1 1.2 5.0 5.3 4.6 4.9 4.95 0.342 1.33 1.30 1.60 1.11 1.33.5 .06 5.08 5.31 5.00 5.11 46.140

6.6

4.6

1.2 1.6

Mean,

for the year,

* The figures in this column express the difference between the two preceding columns.

The greatest range of the barometer, in 24 hours, was on the 12th and 13th of February, =1.260 inches.

The barometer was Lowest, February 13th, at 9 A. M.=29.044,-attached thermometer, 50° Highest, April 2d, at 9, A. M.,=30.826,–

350 Extreme range during the year, 1.782.

The mean height of the barometric column, at the hours specified above, during the year, was 29.968; its cistern being 44 feet above the mean level of high water, Charles River, at Brighton Bridge.

45.80 Mean Tempera. at

of the Spring mo's. 45.57

Summer 67.77 M. of Sum. & Win. 45.02. the hours mentioned

Autumn 47.40 M. of Spr. & Aut. 46.48.

Winter 22.27 Mean of Sunimer's heat, at 3, P. M. 76.87 Maximum heat, June 24–27, July 22,

+ 91.0 Minimum Jan. 12,

9.0 Range of thermometer during the year, 100.0

The external thermometer, Fahrenheit's scale, has entire exposure on the north side of the building; the sun never shines directly upon it, and it is affected by reflected heat only occasionally, at the 3 P. M. observation, and this probably to a small amount; it is fixed on a bracket projecting six inches from the wall, and is six feet above the surface of the ground. The barometric observations have been corrected for capillary action, and reduced to the temperature of 32° Fahrenheit, but not for elevation. The rain gauge is a cubical box of zinc, 10 inches by the side, and rests on the surface of the ground.

The hours of observation adopted in these tables, are those generally used by observers in England. The mode of notation for the winds and clouds also deserves notice. In the former case, 0 denotes a perfect calm, and 6 the greatest violence of the wind. In the latter case, 0 denotes a sky without any clouds, and 10 a sky completely overcast. As uniformity in these tables is very desirable, it is to be wished that this method should be adopted by observers throughout the country.

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