| 释义 |
seeing
see·ing S0215400 (sē′ĭng)conj. Inasmuch as; in view of the fact: Seeing that you're already at the door, I suppose I must invite you inside.n. Astronomy The clarity of focus of an image in a telescope, measured by the angular size of a single star in that image.seeing (ˈsiːɪŋ) n1. the sense or faculty of sight; vision2. (Astronomy) astronomy the quality of the observing conditions (esp the turbulence of the atmosphere) during an astronomical observationconj (often foll by: that) in light of the fact (that); inasmuch as; sinceUsage: The use of seeing as how as in seeing as (how) the bus is always late, I don't need to hurry is generally thought to be incorrect or non-standardsee•ing (ˈsi ɪŋ)
conj. considering; inasmuch as. [1495–1505] Thesaurus| Noun | 1. |  seeing - perception by means of the eyes beholding, visual perceptionperception - the process of perceivingcontrast - the perceptual effect of the juxtaposition of very different colorsface recognition - the visual perception of familiar facesobject recognition - the visual perception of familiar objectsvisual space - the visual perception of spaceoptical fusion, fusion - the combining of images from the two eyes to form a single visual percept | | 2. |  seeing - normal use of the faculty of visioneyesight, sightednessvisual modality, visual sense, vision, sight - the ability to see; the visual faculty | | Adj. | 1. | seeing - having vision, not blindsighted - able to see |
seeingnounThe faculty of seeing:eye, eyesight, sight, vision.Archaic: light.Translationsallontanarsiqualità dell'immaginevedentevistaseeing
See:- (I'll) be seeing ya
- (I'll) be seeing you
- be seeing things
- be seeing you
- first see the light of day
- I'll be seeing you
- see (one) across (something or some place)
- see (one) back (to something or some place)
- see (one) coming
- see (one) down (to something or some place)
- see (one) home
- see (one) in hell first
- see (one) in the flesh
- see (one) right
- see (one) through
- see (one) to (some place)
- see (one) up to (some place)
- see (someone or something) in a new light
- see (someone's) point
- see (something) a mile off
- see (something) against (something else)
- see (something) coming
- see (something) out
- see (something) through
- see (something) through rose-colored glasses
- see (something) through rose-coloured spectacles
- see (the) red mist
- see (to it) that (something happens)
- see a lot of (one)
- see a man about a dog
- see a man about a horse
- see about (something)
- see after (someone or something)
- see ahead
- see around
- see as (something)
- see beyond (someone or something)
- see daylight
- see double
- see eye to eye
- see fit (to do something)
- see for (oneself)
- see how the land lies
- see how the wind blows
- see how the wind is blowing
- see in
- see into
- see no further than (the end of) (one's) (own) nose
- see no objection
- see over (someone or something)
- see pink elephants
- see pink spiders
- see reason
- see red
- see sense
- see snakes
- see stars
- see that it is done
- see the (hand)writing on the wall
- see the back of (someone or something)
- see the color of (one's) money
- see the elephant
- see the error of (one's) ways
- see the funny side (of something)
- see the glass as half empty
- see the glass as half full
- see the light
- see the light at the end of the tunnel
- see the light of day
- see the point in (doing) (something)
- see the sights
- see the world
- see things
- see through (someone or something)
- see to (someone or something)
- see which way the cat jumps
- see which way the wind blows
- see which way the wind is blowing
- see with half an eye
- seeing as/that...
- Seeing is believing
- seeing pink elephants
- seeing pink spiders
- seeing snakes
- seeing that
- seeing things
- you're seeing things
seeing
seeing, in astronomy, the clarity with which stars and other celestial objects can be observed. It is primarily determined by the atmosphere of the earth. The most obvious phenomenon is twinkling, when the brightness of a star seems to fluctuate. Known to astronomers as scintillation, twinkling is caused by thermal motion of the air, which swirls air layers of different temperature and density. This motion causes minute alterations in the path of light from a star because different densities of air will bend light by different amounts. Twinkling is most obvious near the horizon because the light path from a star passes through more of the atmosphere. Since a planet is a disk and not, as a star, a point source, it will not usually show twinkling, but undulations across its surface can be viewed when it is near the horizon owing to the same effect. In addition, the atmosphere is denser at the bottom than at the top and thus continually bends a ray of light from a star more and more toward the vertical. As a result, all stars except those directly overhead appear to be closer to the zenith than they actually are; this is most pronounced for stars near the horizon. This effect causes the sun (or moon) to appear elliptical when it is rising or setting because its bottom edge is raised more by the refraction of the atmosphere than its top. Astronomical observatories are located in areas where seeing is good, usually on mountains where they are above some of the more turbulent layers of the atmosphere and also removed from cities' lights. Astronomers consider the seeing excellent when the star image covers 0.5" of sky or less. Some observatories use adaptive optics, in which telescope optics are adjusted instantly by computer to correct for seeing effects.seeing The quality of the observing conditions at the time of telescopic observation. The various degrees of good or bad seeing depend on the amount of turbulence in the Earth's atmosphere. Turbulence distorts the plane wavefront of a beam of radiation, which has traveled more or less undisturbed through space, and transforms it into a perturbed ‘corrugated’ wavefront. On the few occasions when atmospheric turbulence is very low, a small steady disk-shaped optical image of a point source (such as a star) results. Poor seeing mainly produces small erratic movements in the image position (see scintillation) so that the overall image is blurred, distorted and enlarged. In next-generation telescopes, adaptive optics is used to remove or greatly reduce the effects of atmospheric turbulence. Without such technology, it is the seeing that imposes the main limitation on the instrument's spatial resolution: the minimum diameter of the optical image, resulting from diffraction (see Airy disk), can be as low as 0.025 arc seconds but the spatial resolution may only be one or two arc seconds, or more, as a result of poor seeing. In amateur astronomy the seeing can be evaluated using the Antoniadi scale, a system devised in the early 20th century by Eugène M. Antoniadi: the observer allocates a Roman numeral from I to V to conditions varying from perfect seeing, through good, moderate, poor, to appalling. seeing[′sē·iŋ] (astronomy) The clarity and steadiness of an image of a star in a telescope. seeing Astronomy the quality of the observing conditions (especially the turbulence of the atmosphere) during an astronomical observation MedicalSeeseeseeing
Synonyms for seeingnoun the faculty of seeingSynonyms- eye
- eyesight
- sight
- vision
- light
Synonyms for seeingnoun perception by means of the eyesSynonyms- beholding
- visual perception
Related Words- perception
- contrast
- face recognition
- object recognition
- visual space
- optical fusion
- fusion
noun normal use of the faculty of visionSynonymsRelated Words- visual modality
- visual sense
- vision
- sight
adj having vision, not blindRelated Words |