Topographic surveying; including geographic, exploratory, and military mapping, with hints on camping, emergency surgery, and photography . E. 303. Interconversion of Time—Sidereal time is referredto a fixed star, mean time to the sun. There is one moresidereal than solar day in the year. sidereal days = mean solar days. 24 hrs. sidereal time = 23 hrs. 56 min. sec. meansolar time. 24 hrs. mean time = 24 hrs. 03 min. sec. siderealtime. Relations of Sidereal, Civil, and Mean Solar Time. T, — a^ = I v^hen T^y a/, (116) 24^+ ^s — 01, = /when T, <, a,; . . (117) /; =
Topographic surveying; including geographic, exploratory, and military mapping, with hints on camping, emergency surgery, and photography . E. 303. Interconversion of Time—Sidereal time is referredto a fixed star, mean time to the sun. There is one moresidereal than solar day in the year. sidereal days = mean solar days. 24 hrs. sidereal time = 23 hrs. 56 min. sec. meansolar time. 24 hrs. mean time = 24 hrs. 03 min. sec. siderealtime. Relations of Sidereal, Civil, and Mean Solar Time. T, — a^ = I v^hen T^y a/, (116) 24^+ ^s — 01, = /when T, <, a,; . . (117) /; = «.+ Z^,,.: (118) T„, = I- Dr, (119) r,„ = r for Z?, if 7; I2\ . (122)For example see Article 315. Relation of Sidereal Time to Right Aseension andHour-angle of a Star. T, = a-{-t (123) and t — T,— a (124) Relations of Sidereal and Mean Solar Intervals of Time.—Let r = ratio of tropical year, expressed in sidereal day totropical year expressed in mean solar day; then 695 696 TIME. Table of mean time into sidereal INTERCONVEKSION OF TIME. 697 Table of sidereal time into mean time. (From Smithsonian Geographical Tables.) ... m m m s ° I 2 3 h m s h m s h m s h m s s m s s m s 0 I 000 6 6 15 12 12 29 18 18 44 0 0 3 3 066 6 12 21 12 18 3s 18 24 ^0 0 4 3 7 2 0 12 12 6 18 27 12 24 42 18 30 56 0 7 0 .52 3 10 3 0 iS 19 6 24 33 12 30 48 18 37 2 0 II 0 •53 3 M 4 0 24 25 6 30 40 12 36 54 >8 43 9 0 04 0 IS 0 54 3 18 S 0 30 31 6 36 46 12 43 0 18 49 15 ! 0 18 0 55 3 21 6 0 36 37 6 42 52 12 49 7 18 IS 21 ! 0 22 0 S6 3 25 7 0 42 44 6 48 58 12 55 3 19 I 27 0 26 0 57 3 29 8 0 48 50 6 55 4 »3 I 9 9 7 34 1 0 29 0 S8 3 32 9 0 54 56 7 I 11 »3 7 25 19 13 40 0 33 0 i;g 3 36 10 112 7 7 7 13 13 31 iq 19 40 0 37 0 60 3 40 II I 7 9 7 3 23 >3 9 38 9 25 52 0 40 3 43 12 I 13 15 7 9 29 •3 25 44 >9 31 59 0 12 0 44 0 62 3 47 >3 I 19 21 7 25 36 13 31 50 19 38 5 0
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