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Reader if you are in the Detroit, MI area there's a new campus crossing over (whatever that mean) and they want y'all to join them.

The declination angle is negative if magnetic north lies to the west of true north and is positive if the magnetic north lies to the east of true north (refer figure below).

The azimuth of a wellbore at any point is defined as the direction of the wellbore on a horizontal plane measured clockwise form a north reference.

The vertical line is always parallel to the direction of earth's gravity.

By industry standard, 0 degree inclination is vertical (downward pointing) and 90 degrees inclination is horizontal.

He served as a soldier, but is best known for his novel, Les Liaisons Dangereuses (in English, Dangerous Liaisons).However, the final calculated coordinates are always converted to either True North or Grid North. The divergence between true north and magnetic north is different for most points on the earth’s surface, and in addition to this the magnetic north pole changes its position very slightly each year.The angle in degrees between true and magnetic north is called the declination angle.Magnetic azimuths are not constant due to the movement of the north and south magnetic poles and hence magnetic measurements may be in error due to local magnetic field variations.In oil wells, all surveys with ‘magnetic type’ tools are initially given an azimuth reading referenced to Magnetic North.