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surveying instrument consisting of a spirit level and a sighting tube; used to measure the angle of inclination of a line from the observer to the target Abney level
angular separation between two objects as perceived by an observer angular distance
British anthropologist (born in Poland) who introduced the technique of the participant observer (1884-1942) Bronislaw Kasper Malinowski , Bronislaw Malinowski , Malinowski
optical device consisting of an attachment that enables an observer to view simultaneously the image and a drawing surface for sketching it camera lucida
(astronomy) a heavenly body's highest celestial point above an observer's horizon culmination
light or sound wave change when source and observer in motion Doppler effect
change in the apparent frequency of a wave as observer and source move toward or away from each other Doppler effect , Doppler shift
close observer eyewitness
(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day HA , hour angle
angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body hour angle
(cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the reciprocal of the Hubble constant is the age of the universe Hubble's constant , Hubble constant
(astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer Hubble's law , Hubble law
advice, observer offering unwanted kibitzer
card game observer who makes comments kibitzer
imaginary straight line along which an observer looks line of sight , line of vision
close observer; someone who looks at something (such as an exhibition of some kind) looker , spectator , viewer , watcher , witness
point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected nadir
fire for which the point of impact (the burst) can be seen by an observer; fire can be adjusted on the basis of the observations observed fire
meridian that passes through the observer's zenith observer's meridian
facing the observer obverse
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