Surveying

a₁ aerial camera astronomical triangle axis of tilt azimuth calculated camera axis carrier wave celestial sphere centre chronometer circumpolar star co-latitude co-ordinates computed correction datum declination determined difference earth ecliptic elevation elongation equal altitudes equation error exposure station flight lines focal length focal plane given Greenwich Hence horizontal angle hour angle instant instrument intersection isocentre k₂ known latitude lens longitude M₁ M₂ mean sun mean time interval measured meridian altitude method nadir point nodal point observed altitude overlap parallax perpendicular photogrammetry point of Aries pole position prime vertical principal line principal point radial rays reflector refraction relief displacement remote sensing right ascension scale second Total sidereal sin² Solution stereoscopic Subtract sun's templets theodolite tilt displacement tilted photograph total station transit vertical angle vertical photograph wave length zenith distance