TABLE IV. PROPORTIONAL PARTS. Interval 120 130 140 150 160 170 180 300 310 320 330 2 hours. 1234 123 36 1 0 12 24 33 35 37 40 42 70 34 36 39 41 44 31 31 34 36 40 42 45 75 78 80 39 41 44 46 33 33 36 38 44 47 50 34 34 37 40 42 45 48 51 40 40 43 47 50 53 57 60 41 41 44 48 42 42 46 49 43 43 47 44 44 48 51 55 45 45 49 88 90 94 96 99 102 96 96 99 102 105 108 93 55 58 62 102 106 109 113 116 120 123 63 105 108 112 116 48 48 52 56 60 64 68 72 120 124 49 49 53 57 61 65 69 74 122 127 131 135 139 143 147 48 102 105 70 56 92 96 99 102 105 108 111 24 44 48 51 54 57 95 98 101 104 108 111 114 98 101 104 107 110 114 117 36 119 122 126 24 56 60 64 68 112 116 120 70 118 121 57 61 64 108 111 115 118 122 125 129 110 114 117 121 125 128 132 124 128 131 135 69 115 119 123 126 130 134 138 125 129 133 137 141 128 132 136 140 144 36 90 24 36 EXAMPLE: Required the Moon's right ascension and declination for January 25, 1925, Greenwich civil time 13h 10m. 14: R. A. 21 24 32301; Dec. 15° 41′.8164. The nearest even hour is 14; the interval is 50m; the difference or increase of right ascension in 2h is 301; the difference of declination in 2h is 164 and is northward or positive. From Table IV with the arguments 50m and 301 take out the change in right ascension; and with the arguments 50m and 164 take out the change in declination. Subtract the changes, since the interpolation is here made backward. January 25, 14h Om Change in 50 Right Ascension. hm s 21 24 32 2 5 Declination. -15 41.8 + 0 6.9 APPENDIX II. A COLLECTION OF FORMS FOR WORKING DEAD RECKONING AND VARIOUS ASTRONOMICAL SIGHTS, WITH NOTES EXPLAINING THEIR APPLICATION UNDER ALL CIRCUMSTANCES. (The figures in parenthesis refer to the Notes following these forms.) For the remainder of the work, by which the hour angles and thence the longitudes are found, employ the method given under "Form for Time Sight of a Star (Sumner Line)." |