The Earth Flashcards
What is the circumference of the earth?
21,600nm
40,000km
What is the difference between the polar circumference and the equatorial circumference?
The equatorial circumference will always be longer than the same route over the poles
What is the term used for the movement of the sun around the earth?
Obliquity of the ecliptic
What is the name of the mapping survey that defines the shape of the earth?
World geodetic system of 1984
WGS84
What is the angle the earth is inclined to the plane of its orbit around the sun?
66.5 degrees
What is heading?
The direction the aircraft is pointing in the air measured in degrees clockwise from a specified datum
What is track?
The direction taken by the path of the aircraft over the ground measured in degrees clockwise from a specified datum
What is drift?
The angle between heading and track
What shape indicates true north?
Diamond
What shape indicates magnetic north?
Half diamond
What are lines of equal magnetic variation called?
Isogonals
What are lines joining 0 variation called?
Agonic lines
What is variation?
The difference between magnetic north and true north
What is the deviation?
The difference between magnetic north and compass north
What shape represents compass north?
C
