How and why true meridian different than magnetic meridian?
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the difference between True Meridian and Magnetic Meridian
¤ True meridians are fixed, whereas magnetic meridians vary with time and location.
¤ True meridian may be established by astronomical observation, while magnetic meridian can be formed using freely moving magnetized needle.
¤ True meridian passes through the center of the north and south poles, but not necessarily, in case of magnetic meridians
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