Fr.: coucher acronyque
The setting of a star at nightfall. → heliacal setting.
Fr.: coucher apparent
The instant of time when the object is in the West and the geometric → zenith distance is equal to 90° plus the → horizontal refraction plus the semidiameter minus the → parallax.
Fr.: coucher héliaque
The last visible setting of a star below the western horizon just after sunset entering into a conjunction with the Sun.
setâre-ye hamiše peydâ (#)
A star that is always seen above the horizon from a given position. These stars are located between the celestial pole and a diurnal circle with an angular distance smaller than the altitude of the pole. Same as → circumpolar star.
Nonsetting, from → non- + setting adj. of → set; → star.
Setâré, → star; hamiše peydâ literally "always visible," coined by Biruni (A.D. 973-1050) in his at-Tafhim, from hamišé "always," → perpetual, + peydâ, → visible.
1) forušod (#); 2) bešte
Fr.: 1) coucher; 2) configuration, réglage
1) The act of setting; the appearance of a → celestial body
below the → horizon. Opposite
of → rising.
Fr.: cercles de pointage
Two graduated disks attached to the right ascension and declination axis of an equatorial mount used in amateur astronomy that help an observer find astronomical objects in the sky by their equatorial coordinates.
M.E.; O.E. settan "cause to sit, put in some place, fix firmly" (cf. O.N. setja, O.Fris. setta, Du. zetten, Ger. setzen); → circle.
Dâyeré, → circle; âmâj-giri "taking aim," from âmâj "aim, target," → point + giri "taking" (vebal noun of gereftan "to take, seize, hold;" Mid.Pers. griftan, gir- "to take, hold, restrain;" O.Pers./Av. grab- "to take, seize," cf. Skt. grah-, grabh- "to seize, take," graha- "seizing, holding, perceiving," M.L.G. grabben "to grab," from P.Gmc. *grab, E. grab "to take or grasp suddenly;" PIE *ghrebh- "to seize").