TN Week 1
Terms
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- terrestrial navigation
- navigation of or relating to earthly bodies.
- great circle
- The intersection of a sphere and a plane through its center.
- terrestrial equator
- great circle whose plane is perpendicular to the polar axis.
- terrestrial meridian
- A north-south reference line, particularly a great circle through the geographical poles of the earth.
- prime meridian
- passes through 0 longitude, used as the origion for the measurements of longitude located in Greenwich, England.
- terrestrial longitude
- the arc of a parallel, or the angle at the pole, between the prime meridian and the median point measured eastward or westward 180 of the prime meridian.
- terrestrial latitude
- angular distance from the equator measured northward or southward through 90 and labeled N or S to indicate direction
- small circle
- The intersection of a sphere and plane which does not pass through its center.
- parallel of latitude
- a circle on the surface of the earth parallel to the equator used to determine latitude.
- departure
- The point at which reckoning of voyage begins.
- nautical mile
- considered the length of 1 minute of any great circle of the earth, the meridian being the great circle most commonly used.
- knot (speed)
- a unit of speed equal to one nautical mile per hour.
- heading
- the horizontal direction a ship points at any instant, expressed in angular units from a reference direction, usually from 000 at the reference direction through 360.
- rhumb line
- a line on the surface of the eart making the same oblique angle with all meridians, making a loxodrome curve that spirals toward the poles in a constant true direction.
- course
- the direction at which a vessel is steered or intended to be steered, expressed as angular distance from North, usually from 000 at north, clockwise through 360.
- bearing
- the horizontal direction of one terrestrial point from another, expressed as the angular distance from a reference point.