True north vs magnetic north

TRUE NORTH

     True north is the direction beside the earth’s surface in the direction of the geographic North Pole. It is also called geodetic north. True north is the point on the glob that is exactly 90 degrees north of the equator.  We can measure true north by which earth’s rotation axis meets the surface. Another name for true north is GEOGRAPHIC NORTH. Geographic north is the direction that we use in pas which is always same. It won’t change over years. True north is an imaginary straight line which is passes among you and geographical pole on the globe. PHYSICAL NORTH is where we are facing into it. any direction that we are facing will be our north which is changeable.

MAGNETIC NORTH

     The magnetic north is the direction that the north-seeking arrow of a compass points. The magnetic north pole is the northern pole of the earth’s magnetic pole which changes over year. It is located 82.7 degrees north latitude. Since magnetic pole is the direction that your compass points thus you must adjust your compass accordingly. Magnetic pole is the point where the magnetic field are vertical and enters the earth. There is always angular difference between true north and magnetic north. This difference is called declination. Every five years there is an update for magnetic north for the reason that it’s not stable. This can be observed by looking at the rocks around the places where the sea floor is spreading. Changing of magnetic pole is very gradual, last time that magnetic pole switched was about 730,000 years ago. The difference between GN and MN is important when you are using compass. In western territories the difference among them is about 98 degrees, while in Toronto in about 9 degrees west of north however in Churchill is 0 degrees. In Alaska there is a huge difference between GN and MN. In 2005 the difference between GN and MG was about 810 km.

One of the important fact about magnetic north is that, when people call is “magnetic north” it’s actually south pole of the earth, the reason of that is because of earth’s magnetic field.     

                                

different magnetic north in different years 

REFERENCE 

Abbr , N. (2000). magnetic north . In the free dictionary. Retrieved februray 23, 2013, from http://www.thefreedictionary.com/magnetic+north.

 Goodman, J. (2001). Magnetic North Pole vs. Geographic North Pole. In science and science teaching . Retrieved february 21,2013, from http://www1.appstate.edu/~goodmanj/4401/notes/magnets/mnvsgn.html. 

 ("True north copmare to magnetic north",2000). In answer.com. Retrieved february 22,2013, from http://wiki.answers.com/Q/What_is_true_north_compared_to_magnetic_north.

 ("Difference between true north and magnetic north", 2006) . In fun trivia. Retrieved february 23,2013, from http://www.funtrivia.com/askft/Question66680.html.

("Difference between true north and magnetic north in compass", 2013). In yahoo answer. Retrieved februray 23, 2013, from http://answers.yahoo.com/question/index?qid=20100428215956AA3qrhd.