lines of longitude
21International Date Line — Date line redirects here. For other uses, see Dateline (disambiguation). The International Date Line around 180° The International Date Line (IDL) is a generally north south imaginary line on the surface of the Earth, passing through the middle… …
22Alberta Township System — The Alberta Township System (ATS) is a land surveying system used in the Canadian province of Alberta and other parts of Western Canada.History and backgroundIn principle there is a mathematical basis for the Alberta Township System (ATS) variant …
23Complex plane — Geometric representation of z and its conjugate in the complex plane. The distance along the light blue line from the origin to the point z is the modulus or absolute value of z. The angle φ is the argument of z. In mathematics …
24electromagnetism — /i lek troh mag ni tiz euhm/, n. 1. the phenomena associated with electric and magnetic fields and their interactions with each other and with electric charges and currents. 2. Also, electromagnetics. the science that deals with these phenomena.… …
25Circle 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 …
26Quaternions and spatial rotation — Unit quaternions provide a convenient mathematical notation for representing orientations and rotations of objects in three dimensions. Compared to Euler angles they are simpler to compose and avoid the problem of gimbal lock. Compared to… …
27North Pole — For other uses, see North Pole (disambiguation). Coordinates: 90°N 0°W / 90°N 0°W / 90; 0 …
28line — 1 noun LONG THIN MARK 1 (C) a long thin, usually continuous mark on a surface: A wiggly line showed where the river was. | straight line: Can you draw a straight line? | dotted line (=a broken straight line drawn or printed on paper): Sign your… …
29Michigan Meridian — Base Line Meridian map depicting principal meridians and baselines used for in surveying the United States …
30Lune (mathematics) — In geometry, a lune is either of two figures, both shaped roughly like a crescent Moon. The word lune derives from luna, the Latin word for Moon. Contents 1 Plane geometry 2 Spherical geometry 3 Lune of Hippocrates …
