MAGNETIC MERIDIAN
PRIME MERIDIAN
Prime meridian is the meridian which passes through green-which,other meridian are named East or West from the prime meridian
VARIATION
The magnetic poles are not in the same potions as the geographic poles,there is an angel between the magnetic and the geographic meridian.The angel between them known as the VARIATION.
Variation is different at different places.It id termed East,if the magnetic North lies to East or right of the true North.,and West if the magnetic North lies West or left of the true North.
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