principal vertical circle

См. также в других словарях:

• vertical circle — A great circle of the celestial sphere passing through the celestial poles as well as the observer’s zenith and nadir. Vertical circles are perpendicular to the horizon. The prime vertical circle, or the prime vertical, passes through the east… …   Aviation dictionary

• Circle of latitude — Map of Earth Longitude (λ) Lines of longitude appear vertical with varying curvature in this projection, but are actually halves of great ellipses, with identical radii at a given latitude. Latitude (φ) Lines of latitude appear …   Wikipedia

• Meridian circle — Groombridge transit circle of 1806 The meridian circle, transit circle, or transit telescope is an instrument for observing the time of stars passing the meridian, at the same time measuring its angular distance from the zenith. The idea of… …   Wikipedia

• Mohr's circle — Mohr s circles for a three dimensional state of stress Mohr s circle, named after Christian Otto Mohr, is a two dimensional graphical representation of the state of stress at a point. The abscissa, , and ordinate …   Wikipedia

• Radius of curvature (applications) — The distance from the center of a sphere or ellipsoid to its surface is its radius. The equivalent surface radius that is described by radial distances at points along the body s surface is its radius of curvature (more formally, the radius of… …   Wikipedia

• telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …   Universalium

• azimuth — i. A direction expressed as a horizontal angle, usually in degrees, measured clockwise from a reference datum or direction, usually north. The azimuth will be a true zenith, grid azimuth, magnetic azimuth, or relative azimuth, depending upon… …   Aviation dictionary

• Cardinal — Car di*nal, a. [L. cardinalis, fr. cardo the hinge of a door, that on which a thing turns or depends: cf. F. cardinal.] Of fundamental importance; pre[ e]minent; superior; chief; principal. [1913 Webster] The cardinal intersections of the zodiac …   The Collaborative International Dictionary of English

• Cardinal numbers — Cardinal Car di*nal, a. [L. cardinalis, fr. cardo the hinge of a door, that on which a thing turns or depends: cf. F. cardinal.] Of fundamental importance; pre[ e]minent; superior; chief; principal. [1913 Webster] The cardinal intersections of… …   The Collaborative International Dictionary of English

• Cardinal points — Cardinal Car di*nal, a. [L. cardinalis, fr. cardo the hinge of a door, that on which a thing turns or depends: cf. F. cardinal.] Of fundamental importance; pre[ e]minent; superior; chief; principal. [1913 Webster] The cardinal intersections of… …   The Collaborative International Dictionary of English

• Cardinal signs — Cardinal Car di*nal, a. [L. cardinalis, fr. cardo the hinge of a door, that on which a thing turns or depends: cf. F. cardinal.] Of fundamental importance; pre[ e]minent; superior; chief; principal. [1913 Webster] The cardinal intersections of… …   The Collaborative International Dictionary of English