Kaye and Laby: Versions History
Subsection 2.7.6 Geomagnetism
- Date of go live: 22 August 2011
- Change type: Revised presentation
- Summary of changes between versions 2.0 and
Text changed to reduce the need for frequent updates. Table
of Gauss coefficients replaced by 3 figures describing the earth's magnetic
field. A new figure shows the long term variation of Declination at Greenwich.
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- Date of go live: 21 November 2008
- Summary of changes between versions 1.0 and
The descriptive text was completely rewritten and expanded.
An account was given of the World Magnetic Model 2005, a mathematical model
from which the earths magnetic field components may be calculated. A
table of current values of the coefficients used in this model was included and
a link provided to the British Geological Survey website on which charts and
other data were displayed. The tables of Magnetic elements at London
since 1580 and of Geomagnetic data 1990 were omitted.
- Date of go live: 15 July 2005
This was the first published online
version of Kaye and Laby - as the unedited contents of the hard copy 16th
edition (published 1995)