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{adj: acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp} having or demonstrating ability to recognize or draw fine distinctions
"an acute observer of politics and politicians"
"incisive comments"
"icy knifelike reasoning"
"as sharp and incisive as the stroke of a fang"
"penetrating insight"
"frequent penetrative observations"

{adj: clean, unobjectionable} (of behavior or especially language) free from objectionable elements; fit for all observers
"good clean fun"
"a clean joke"
<-> dirty

{adj: dextral} of or on the right
"a dextral gastropod shell with the apex upward has its opening on the right when facing the observer"
"a dextral flatfish lies with the right eye uppermost"
<-> sinistral

{adj: impersonal, neutral} having no personal preference
"impersonal criticism"
"a neutral observer"

{adj: pitying, sorry} feeling or expressing sorrow or pity
"a pitying observer threw his coat around her shoulder"

{adj: sinistral} of or on the left
"a sinistral gastropod shell with the apex upward has its opening on the left when facing the observer"
"a sinistral flatfish lies with the left eye uppermost"
<-> dextral

{adj: sympathetic} expressing or feeling or resulting from sympathy or compassion or friendly fellow feelings; disposed toward
"sympathetic to the students' cause"
"a sympathetic observer"
"a sympathetic gesture"
<-> unsympathetic

{adv: beyond, on the far side} on the farther side from the observer
"a pond with a hayfield beyond"

{adv: endways, endwise, end on} with the end forward or toward the observer
"houses built endways"

{n: Abney level} a 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

{n: Doppler effect, Doppler shift} change in the apparent frequency of a wave as observer and source move toward or away from each other

{n: Hubble's constant, Hubble constant} (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

{n: Hubble's law, Hubble law} (astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer

{n: Malinowski, Bronislaw Malinowski, Bronislaw Kasper Malinowski} British anthropologist (born in Poland) who introduced the technique of the participant observer (1884-1942)

{n: angular distance} the angular separation between two objects as perceived by an observer
"he recorded angular distances between the stars"

{n: camera lucida} an optical device consisting of an attachment that enables an observer to view simultaneously the image and a drawing surface for sketching it

{n: culmination} (astronomy) a heavenly body's highest celestial point above an observer's horizon

{n: hour angle, HA} (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

{n: hour angle} the angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body

{n: human nature} the shared psychological attributes of humankind that are assumed to be shared by all human beings
"a great observer of human nature"

{n: line of sight, line of vision} an imaginary straight line along which an observer looks

{n: magic trick, conjuring trick, trick, magic, legerdemain, conjuration, thaumaturgy, illusion, deception} an illusory feat; considered magical by naive observers

{n: nadir} the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected
<-> zenith

{n: observed fire} 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

{n: observer's meridian} a meridian that passes through the observer's zenith

{n: observer, commentator} an expert who observes and comments on something

{n: perceiver, percipient, observer, beholder} a person who becomes aware (of things or events) through the senses

{n: principle of equivalence} (physics) the principle that an observer has no way of distinguishing whether his laboratory is in a uniform gravitational field or is in an accelerated frame of reference

{n: radial velocity} velocity along the line of sight toward or away from the observer

{n: recognition, identification} the process of recognizing something or someone by remembering
"a politician whose recall of names was as remarkable as his recognition of faces"
"experimental psychologists measure the elapsed time from the onset of the stimulus to its recognition by the observer"

{n: relativistic mass} (physics) the mass of a body in motion relative to the observer: it is equal to the rest mass multiplied by a factor that is greater than 1 and that increases as the magnitude of the velocity increases

{n: rest mass} (physics) the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body

{n: seer} an observer who perceives visually
"an incurable seer of movies"

{n: spectator, witness, viewer, watcher, looker} a close observer; someone who looks at something (such as an exhibition of some kind)
"the spectators applauded the performance"
"television viewers"
"sky watchers discovered a new star"

{n: telemeter} any scientific instrument for observing events at a distance and transmitting the information back to the observer

{n: zenith} the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected
<-> nadir

{v: see} perceive by sight or have the power to perceive by sight
"You have to be a good observer to see all the details"
"Can you see the bird in that tree?"
"He is blind--he cannot see"

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