4 THE ANTARCTIC MANUAL. 1 
TABLE FOR REDUCING THE Troz TO THE Appr. ¢ IN R.A. 
C ce) Cc (olen) 
Hour Pa ae Hour gos 
at true g fee airs sign attrue ¢ a — st len 
bh. m. h. m. h. m. h. m. 
0 0 12 0 25 0 3 0 9 0 18 71 
10 11 50 25 4 10 8 50 17 74 
20 ; 40 25 2 20 40 16 77 
30 30 25 13 30 30 15 a 
40 20 25 17 40 20 14 82 
50 10 25 22 50 10 14 84 
1 0 11 0 24 26 4 0 8 0 I3 87 
10 10 50 24 30 10 a ae 12 89 
20 40 24 B4 20 40 11 OL 
30 30 23 38 30 30 10 92 
40 20 23 42 40 20 9 94 
50 10 22 46 50 10 8 Sf 
2 0 10 0 22 50 a 0 7 0 7 97 
10 9 50 21 54 10 6 50 5 98 
20 40 21 57 20 40 4 98 
30 30 20 61 30 30 3 go 
40 20 19 64 40 20 2 100 
50 10 19 68 50 10 1 100 
3 0 g 0 18 vel 6 0 6 0 0 100 
Then T, denoting the approximate mean time of appt. ¢, in units of 
an hour, 
T = mean time t fo + oe 
= rue paeeeteeeee 
af—-C 
in which a, must be used in minutes of arc; also f = Ma a a the 
value of which for latitude 
70. = 4°98 
Ty = 6°23 
72. » =65°51 
73, = 5°82 
74 s 618 
1D. - = 6°58 
76. . = 7:04 
77 6 Tb 
78 = 8:19 
(ae = 8-92 
