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What is inclination and declination?
What is magnetic declination?
What is a declination angle?
What is a negative declination?
Declination is simply a manifestation of the complexity of the geomagnetic field. The field is not perfectly symmetrical; it has non-dipolar "ingredients," and the dipole itself is not perfectly aligned with the rotational axis of the Earth.
Declination is positive east of true north and negative when west. Magnetic declination changes over time and with location. As the compass points with local magnetic fields, declination value is needed to obtain true north.. more. Declination.
Magnetic declination (also called magnetic variation) is the angle between magnetic north and true north at a particular location on the Earth's surface. The angle can change over time due to polar wandering .
The Earth’s magnetic and geographic poles are in different places, and magnetic declination is the angular difference between the direction a compass needle points and the direction to the geographic North Pole. For most of the populated world, this angle is between zero and 30 degrees.
Magnetic declination is the direction and amount of variation between the Magnetic Pole and True North. The amount and direction of declination depends upon how those two poles align relative to a given point on Earth. When the two poles align, declination is zero, and the line of zero declination is termed the agonic line.
Another type of measurement is often used in structural geology: An inclination is an angle of slope measured downward relative to horizontal. Figure 2: Compass-clinometer used to measure an inclination – in this case the dip of a bedding plane. A horizontal line has an inclination of 00°, and a vertical one is inclined 90°.
The angle of the field relative to the level ground is the inclination, or dip, which is 90° at the north magnetic pole. Finally, the angle of the horizontal intensity with respect to the north geographic pole is the declination, also called variation in mariners' and aviators' jargon. In common terms, declination is the angle between where a ...
