A Treatise on Practical Astronomy: As Applied to Geodesy and Navigation |
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Page viii
... star . Conditions favorable to accuracy . Differential formulæ .... Equal altitudes of a star . PAGE 215 220 222 223 228 Equal altitudes of the sun .. 230 Latitude .. 233 By the zenith distance of a star on the meridian ..... 233 By a ...
... star . Conditions favorable to accuracy . Differential formulæ .... Equal altitudes of a star . PAGE 215 220 222 223 228 Equal altitudes of the sun .. 230 Latitude .. 233 By the zenith distance of a star on the meridian ..... 233 By a ...
Page x
... stars - Method of observing . Azimuth by a circumpolar star near elongation . Correction for diurnal aberration ... Circumpolar stars at any hour - angle ... Correction for second differences in the time . Conditions favorable to ...
... stars - Method of observing . Azimuth by a circumpolar star near elongation . Correction for diurnal aberration ... Circumpolar stars at any hour - angle ... Correction for second differences in the time . Conditions favorable to ...
Page 100
... star passes the meridian at a given time , when we know in fact that the meridian passes the star ; or that the sun rises above the horizon , when in fact the horizon passes below the sun . The reader will never be misled by such ...
... star passes the meridian at a given time , when we know in fact that the meridian passes the star ; or that the sun rises above the horizon , when in fact the horizon passes below the sun . The reader will never be misled by such ...
Page 103
... star may be fixed either by its declination and hour- angle or by its declination and right ascension . - THE DECLINATION of a star is its distance north or south of the equator measured on an hour - circle passing through the star ...
... star may be fixed either by its declination and hour- angle or by its declination and right ascension . - THE DECLINATION of a star is its distance north or south of the equator measured on an hour - circle passing through the star ...
Page 104
... star measured on a great circle , and is the complement of the declination . We shall let 8 Declination of a star ; d = α = Right ascension ; t = Hour - angle ; Р = North - polar distance = 90 ° - 8 . The Ecliptic . 61. When the ...
... star measured on a great circle , and is the complement of the declination . We shall let 8 Declination of a star ; d = α = Right ascension ; t = Hour - angle ; Р = North - polar distance = 90 ° - 8 . The Ecliptic . 61. When the ...
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Common terms and phrases
accuracy altitude angle applied approximation arithmetical mean ascension and declination axis azimuth Bessel catalogue celestial sphere centre chronograph chronometer circle circumpolar stars clamp co-ordinates coefficients collimation computation constant convenient culmination determined difference differential dt dt earth east ecliptic elongation emersion ephemeris equal example follows formulæ geocentric given gives Greenwich horizon hour-angle instant latitude limb logarithms longitude mean solar measured meridian method micrometer middle thread moon moon's right ascension multiplied Nautical Almanac obtained occultation parallax plane position prime vertical probable error proper motion reading reduced refraction right ascension screw semidiameter sextant sidereal sin² star's stars observed Substituting subtract telescope tion transit instrument unknown quantities values vernier weight write zenith distance ΙΟ
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