A Collection of Tables and Formulæ Useful in Surveying, Geodesy, and Practical Astronomy |
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Common terms and phrases
AGARAS axis azimuth Baily Barometer Barometer 30 Inches Chronometer Co-ordinates collimation comparison of French compute convert correction corresponding cubic culmination declination deduced degree Diff Differences of Latitude e² cos² English Barometers English feet English inches equal altitudes Equations to Equal equatorial foot formula found by moving Francœur Greenwich hour angle instrument Intermediate minutes Latitude and Departures-Continued length limb line of deflection longitude mean noon mean solar measure meridian Meridional Arcs-Values metre middle wire miles Millimetres moon moon's moving the decimal Myriametre Nautical Almanac observed parallax parallel Parallel-Values quantities R. A. in Arc Reduction refraction right ascension scale Sextant sin² spherical excess star station Sun's Tables and Formulæ tang tang L Tangent telescope temperature Theodolite tion toises transit Troughton & Simms value Lat vibration weight Yards zenith distance бр
Popular passages
Page 8 - The gallon is a vessel containing 58372.2 grains (8.3389 pounds avoirdupois) of the standard pound of distilled water, at the temperature of maximum density of water, the vessel being weighed in air in which the barometer is 30 inches at 62° Fahrenheit.
Page 161 - L = the Latitude of the place of observation: (minus, when . South) D = the Declination, at the time of noon, on the given day: (minus, when South...
Page 141 - We cannot immediately obtain mean time from observation ; but, from an observation of the true Sun, with the aid of the equation of time, which is the angular distance in time between the mean and the true Sun, we may readily deduce it.
Page 10 - Gallon., containing Ten Pounds Avoirdupois Weight of distilled Water weighed in Air, at the Temperature of Sixty two Degrees of Fahrenheit's Thermometer, the Barometer being at...
Page 141 - Mean solar time is derived from the time employed by the earth in revolving on its axis, as compared with the sun, supposed to move at a mean rate in its orbit, and to make 365.242218 revolutions in a mean Gregorian, y ear.
Page 65 - In terms of the coordinates of rectangular axes referred to one of the points of the triangulation, the latitude and longitude of which are known, — y being the ordinate in the direction of the meridian, and x the ordinate perpendicular to it, — the...
Page 56 - Ln -el of the Sea. Let— r represent the radius of the earth (or better, the normal, N,) corresponding to the base b at the level of the sea ; and r-\- a the radius referred to the level of the measured base B, then — r+a : r:: B : ¿ = Bx — — r+a and — . B—¿=BB -Ï— = В x («- - "! + etcA r-\-a v...
Page 161 - Correction in time, to be applied as an equation to the mean of the times of observed equal altitudes of the sun, in order to obtain the time of its meridional passage...
Page 182 - ... the east, and minus when it falls to the west, and vice versa when pointing to the north; b, the bias or inclination of the axis of the telescope, plus when the west end of the axis is too high ; c, the error in collimation, plus when the circle described by the line of collimation of the telescope falls to the east, and minus when it falls to the west, for upper culminations, and vice versa for lower culminations ; and AR., the right ascension of the star.
Page i - A Collection of Tables and Formulae useful in Surveying, Geodesy, and Practical Astronomy, including Elements for the Projection of Maps. Prepared for the Use of the Corps of Topographical Engineers, by Captain TJ Lee, USA 8vo.