An Etymological Dictionary of Astronomy and Astrophysics

7 terms — A › AZ

A AA AB AC AD AE AF AG AI AL AM AN AP AQ AR AS AT AU AV AW AX AZ

azimuth   سوگان، سمت   sugân, samt Fr.: azimut The → angular distance from the → North point eastward to the intersection of the → horizon with the → vertical circle passing through the object. Azimuth is 0° for an object due north, 90° due east, 180° due south, and 270° due west. → Altitude and azimuth constitute the → horizon coordinate system. Etymology (EN): From O.Fr. azimut, from Ar. as-sumut (السمت) “the directions, ways,” pl. of as-samt “the direction, way.” Etymology (PE): Sugân, from su “direction” + -gân direction suffix.

azimuth circle   پرهون ِ سوگان، دایره‌ی ِ ~   parhun-e sugân, dâyere-ye ~ Fr.: cercle d'azimut One of great circles of the → celestial sphere which passes through the → zenith, → nadir, and the star, cutting the horizon at right angles. Same as → vertical circle. See also: → azimuth; → circle.

azimuthal   سوگانی   sugâni Fr.: azimutal Or, or pertaining to an → azimuth. See also: → azimuth + → -al.

azimuthal angle   زاویه‌ی ِ سوگانی   zâviye-ye sugâni Fr.: angle azimutal In → spherical coordinates, an angle measured from the x-axis in the xy-plane. See also: Azimuthal, adj. from azimuth; → angle.

azimuthal magnetic field   میدان ِ مغناتیسی ِ سوگانی   meydân-e meqnâtisi-ye sugâni Fr.: champ magnétiquue azimutal In the → solar dynamo model, a magnetic field that points from east to west or vice-versa. See also: → azimuthal; → magnetic; → field.

azimuthal projection   فراشانش ِ سوگانی   farâšâneš-e sugâni Fr.: projection azimutale A map projection on which the → azimuths of all points are shown correctly with respect to the center. A plane tangent to one of the Earth’s poles is the basis for polar azimuthal projection. See also: → azimuthal; → projection.

azimuthal quantum number   عدد ِ کو‌آنتومی ِ سوگانی   adad-e kuântomi-ye sugâni Fr.: nombre quantique azimutal In quantum mechanics, a quantum number that distinguishes the different shapes of the orbitals. Etymology (EN): Azimuthal, adj. from → azimuth; → quantum number.