map of isogonic lines

См. также в других словарях:

• 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

• 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

• 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

• History of longitude — The history of longitude is a record of the effort, by navigators and scientists over several centuries, to discover a means of determining longitude. The measurement of longitude is important to both cartography and navigation. Historically, the …   Wikipedia

• Aeronautical chart conventions (United States) — This article describes the graphic conventions used in Sectional charts and Terminal area charts published for aeronautical navigation under Visual Flight Rules in the United States of America. The charts are published in accordance with… …   Wikipedia

• Edmond Halley — Infobox Scientist name = Edmond Halley image width = 240px caption = Portraiture by Thomas Murray, ca. 1687 birth date = birth date|1656|11|08 birth place = Haggerston, Shoreditch, London, England death date = death date and… …   Wikipedia