can anyone can explain Geographic meridian and magnetic meridian?

Question

suggest any links

Answer 1

see:
http://www.oulu.fi/~spaceweb/textbook/coordsys.html

http://roland.lerc.nasa.gov/~dglover/dictionary/g.html
http://roland.lerc.nasa.gov/~dglover/dictionary/m.html

Answer 2

Short and sweet. Look at a typical world map or a globe. The lines running from pole to pole are the geographic meridians and are just graphic constructs used for convenience.
Find the magnetic poles on the map/globe. They are about 11 degrees out of place from the geographic poles.
Construct a system of lines connecting the two poles similar to the one used to connect the geographic poles.
The systems are similar, but not identical. Since the magnetic field is not uniform, the lines connecting the magnetic poles will curve a bit horizontally to match the variations. The field also varies over time so these curvatures are not static.
In New England the variation of the magnetic field may reach over 15 degrees, while in Texas the variation is much less.

Answer 3

A geographic meridian runs straight north and south, from the North pole to the South Pole. A magnetic meridian is a curvy line, running from the north magnetic pole to the south magnetic pole. See the link below for a map of magnetic meridians.