{Isogonic lines} (Magnetism), lines traced on the surface of the globe, or upon a chart, connecting places at which the deviation of the magnetic needle from the meridian or true north is the same. [1913 Webster]
The Collaborative International Dictionary of English. 2000.
isogonic lines — Irregular lines across an aeronautical chart, along which the magnetic north and true north are separated by a given angle. This angle is known as a compass variation … Aviation dictionary
Isogonic — I so*gon ic, a. [Iso + Gr. gwni a angle.] Pertaining to, or noting, equal angles. [1913 Webster] {Isogonic lines} (Magnetism), lines traced on the surface of the globe, or upon a chart, connecting places at which the deviation of the magnetic… … The Collaborative International Dictionary of English
isogonic — [ī säg′ə nəlī΄sō gän′ik, ī΄səgän′ik] adj. [ ISO + GON + IC] 1. of or having equal angles 2. connecting or showing points on the earth s surface having the same magnetic declination [isogonic lines on a map] 3. of or having to do with isogony:… … English World dictionary
isogonic — adjective a) Describing imaginary lines connecting points on the earths surface of identical magnetic declination. b) Having equal angles. Syn: isogonal See Also: isogonic line, agonic line … Wiktionary
Magnetic declination — Example of magnetic declination showing a compass needle with a positive (or easterly ) variation from geographic north. Magnetic declination is the angle between magnetic north (the direction the north end of a compass needle points) and true… … Wikipedia
Contour line — This article is about lines of equal value in maps and diagrams. For more meanings of the word contour , see Contour (disambiguation). The bottom part of the diagram shows some contour lines with a straight line running through the location of… … Wikipedia
Earth's magnetic field — Computer simulation of the Earth s field in a normal period between reversals.[1] The tubes represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and… … Wikipedia
magnetic chart — A chart showing the distribution of one of the magnetic elements, such as by isogonic lines. Also called an isogonic chart. See isogonic lines … Aviation dictionary
isogonal — A line drawn on a map or a chart joining points of equal variation (magnetic declination). On aeronautical charts, isogonic lines appear as irregular dashed lines (−3° E), and their values also are indicated alongside the lines. The annual change … Aviation dictionary
Isoclinic line — Isoclinic lines are lines connecting those parts where the inclination of the Earth s magnetic field is the same in amount. They are similar to isogonic lines. which are lines connecting points of equal magnetic declination. The line drawn… … Wikipedia
