Practical Astronomy for Engineers
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. . .
Equations ( 180) used in connection with tables for log G, or with formulae (182) afford a convenient and precise method of calculating the azimuth of any of the close circumpolar stars whose apparent places are given in the Ephemeris, pp. 312-323.
Equations (180) are rigorous, however, and for approximate results they may be simplified, especially if the circumpolar observed is Polaris. For this object TC at the present time is i 11', and for latitudes less than 60, its azimuth will alwa...ys differ from 180 by less than 2 3'. We may therefore write 180 A = 7t (183) with an error not exceeding 2". For latitudes of 45 or less the error will always be less than i".
TABLE IX t logG log G sec (p t 0* o . 0075 o. 1167 24 h I o 0073 0. 1165 23 2 0. 0065 0. 1156 22 3 0. 0053 0. 1145 21 4 0. 0037 0. 1129 20 5 0. 0019 O. IIII 19 6 o. Oooo o. 1092 18 7 9. 9981 o. 1072 17 8 9. 9963 0. 1055 16 9 9. 9948 0. 1039 *S 10 9. 9936 o. 1028 H ii 9. 9928 O. IO2O 13 12 9. 9926 o. 1018 12 Further, logG may be tabulated, as in Table IX, for a mean value of the lati- tude with t as argument.
What to read after Practical Astronomy for Engineers?
You can find similar books in the "Read Also" column, or choose other free books by Frederick Hanley Seares to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
. . .
Equations ( 180) used in connection with tables for log G, or with formulae (182) afford a convenient and precise method of calculating the azimuth of any of the close circumpolar stars whose apparent places are given in the Ephemeris, pp. 312-323.
Equations (180) are rigorous, however, and for approximate results they may be simplified, especially if the circumpolar observed is Polaris. For this object TC at the present time is i 11', and for latitudes less than 60, its azimuth will alwa...ys differ from 180 by less than 2 3'. We may therefore write 180 A = 7t (183) with an error not exceeding 2". For latitudes of 45 or less the error will always be less than i".
TABLE IX t logG log G sec (p t 0* o . 0075 o. 1167 24 h I o 0073 0. 1165 23 2 0. 0065 0. 1156 22 3 0. 0053 0. 1145 21 4 0. 0037 0. 1129 20 5 0. 0019 O. IIII 19 6 o. Oooo o. 1092 18 7 9. 9981 o. 1072 17 8 9. 9963 0. 1055 16 9 9. 9948 0. 1039 *S 10 9. 9936 o. 1028 H ii 9. 9928 O. IO2O 13 12 9. 9926 o. 1018 12 Further, logG may be tabulated, as in Table IX, for a mean value of the lati- tude with t as argument.
What to read after Practical Astronomy for Engineers?
You can find similar books in the "Read Also" column, or choose other free books by Frederick Hanley Seares to read onlineMoreLess
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