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Magnetic and geographic north

 Kaoshiung 2013

 

Twice a year, on the equinox day , the end of the shadow describes a line : the equinox line (east-west direction)

A perpendicular of this line shows the geographic north ( direction of the shortest shadow at solar noon)

 

 

There is a difference between the magnetic north (given by a compass) and the geographic north (given by the direction of the shortest shadow) 

 

This difference is called : Magnetic declination

 

 

Anisacate 2016

 

 

 

 

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