The upshot is that the isogonic
lines showing magnetic variation on sectional charts shift more dramatically each time these updates are applied.
Many other presentations contributed accounts of little known or unknown artefacts, for example the MS chart of isogonic
lines c.1585 by Luis Texeira, and often provided new interpretations of their production and contexts.
When b = 1, the growth is isogonic
, i.e., the part grows at the same rate as the body as a whole, and when b [not equal to] 1, the growth is heterogonic, i.e., the part grows at a rate different from the body, being early (negative) if b < 1 and late (positive) if b > 1.
(2009) noted that research has shown that body component development in lamb may be precocious, delayed or, in some cases, even isogonic
, depending on the genetic group, sex, feeding methods, slaughter weight and the type of cut, body component or tissue analyzed.
With all the handheld GPSes, iStuff, and other gadgets, when did you last measure the distance between two points on a paper chart, measure your true course against the longitude and search for the nearest isogonic
line to east-is-least your magnetic course?
The book began as an academic dissertation, and the author's principal interest lies in such maritime arcana as isogonic
charts of compass variation and such ship-shape topics as nautical pennants.
Halley invented isogonic
charts and was the first to systematically study the Earth's magnetic field and its variation.
Edmond Halley introduced the isogonic
lines or magnetic meridians in the southern hemisphere and Louis Duperrey situated the magnetic South Pole at 76[degrees]S and 135/6[degrees]E.
If the isogonic
lines (the lines of equal air pressure between highs and lows) on the chart are bunched up and close together, expect turbulence aloft.
These lines are called "isogonic
lines" unless it is indicating a zero variation, then it is called an "agonic line." A pilot uses these lines to correct the true course he drew on a chart for variation.
charts show the variation and annual change and are published every five years.