The quantities opposite the different numbers of hours, minutes, and seconds, are to be subtracted, to obtain the equivalent interval of mean solar time for any period.

Minutes.

S.

S. 0.164

31 5.092

0.329 32 5:257
0.493 33 5.421
0.657 34 5.585
0.821

5.750

0.986 36
1.150

5.914
6.078

37

1.314

38 6.242

9 1.478 39 6.407
1.643 40 6.571

10

35

1234567890

11

11

0.030

1 48.421
1 58.278

12

0.036

0.038
0.041

1.807 41 6.735
1.971 42 6.900 12 0.033 42
2 8.134 13 2.136 43 7.064 13
2 17.991 14 2.300 44 7.228
14
2 27.847 15 2.464 45 7.392 15
2 37.704 16 2.628 46 7.557 16 0.044
2 47.560 17 2.793 47 7.721 17 0.047
18 2 57.416 18 2.957 48 7.885 18 0.049
19 3.121 49 8.050 19 0.052
20 3.285 50 8.214 20 0.055

17

19 3 7.273 20 3 17.129

Seconds.

8.

0.003

0.005

0.008

0.011

0.014

0.016

0.019

0.022

0.025

10 0.027

31

32

33

34

35

36

37

38

51

8.378 21 0.057

21 3 26.986 21
3 36.842

3.450
3.614

52 8.542

0.060

23

53 8.707 23 0.063

3 46.699 23 24 3 56.555

3.778
3.943

24

54 8.871

24

0.066
0.068

25 4.107 55 9.035 25
26 4.271 56 9.199
27 4.436 57 9.364

26 0.071
27 0.074

28 4.600 58 9.528 28 0.076

29 4.764

59 9.692

29 0.079
0.082

30 4.928 60 9.856 30

0.112

0.115

0.118

0.120

45 0.123

S. 0.085

0.087

0.090

0.093

0.096

0.098

0.101

0.104

0.106

0.109

46 0.126

47

0.128

48 0.131 49 0.134

50

0.137

0.140

0.142

0.145

0.148

53

54 55

0.150

56 0.153

57
58

0.156
0.159
0.161
0.164

The quantities opposite the different numbers of hours, minutes, and seconds, are to be added, to obtain the equivalent interval of sidereal time for any period.-Vide Table of Equivalents, page 489 of the Nautical Almanac. This table, and the preceding, are calculated from the ratio of a sidereal to a mean solar day-twenty-four hours of mean time being equivalent to 24h 3m 56s-5554 sidereal time.

FOR CONVERTING SPACE INTO TIME, AND VICE VERSA.

TABLE III.

Young's Refractions have been selected from among those, by different eminent Astronomers, given in Dr. Pearson's Tables.