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Naked-Eye Stargazing: Learning the Sky and its constellations; Naked Eye Navigation, Polynesia Voyages (archived 22 February 2004). Detection of weak optical signals by the human visual system: Perspectives in Neuroscience and in Quantum Physics [permanent dead link ] The Naked-eye Planets in the Night Sky (and how to identify them)
The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight. Other functions include maintaining the circadian rhythm, and keeping balance. Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device.
The human eye is an organ which reacts to light for several purposes. As a conscious sense organ, the eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors. [3]
Gross anatomy (also called topographical anatomy, regional anatomy, or anthropotomy) is the study of anatomical structures that can be seen by the naked eye. [1] Microscopic anatomy is the study of minute anatomical structures assisted with microscopes , which includes histology (the study of the organization of tissues), [ 1 ] and cytology ...
The human naked eye has an angular resolution of approximately 280 microradians [17] (μrad) (approx 0.016° or 1 minute of arc), and the ISS targets an altitude of 400 km. [18] Using basic trigonometric relations, this means that an astronaut on the ISS with 20/20 vision could potentially detect objects that are 112 m or greater in all ...
The highest such number that the eye can resolve as stripes, or distinguish from a grey block, is then the measurement of visual acuity of the eye. For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD [43] (1.2 arcminute per line pair, or a 0.35 mm line pair, at 1 m).
The limiting magnitude for naked eye visibility refers to the faintest stars that can be seen with the unaided eye near the zenith on clear moonless nights. The quantity is most often used as an overall indicator of sky brightness, in that light polluted and humid areas generally have brighter limiting magnitudes than remote desert or high altitude areas.
naked eye: furthest object visible with the naked eye, but first recorded by Abd al-Rahman al-Sufi [224] 1654: 3: Triangulum Galaxy: Spiral galaxy: refracting telescope: Giovanni Battista Hodierna [225] 1779: 68 [226] Messier 58: Barred spiral galaxy: refracting telescope: Charles Messier [227] 1785: 76.4 [228] NGC 584: Galaxy: William Herschel ...