The Earth

Question 1

What is the shape of the earth?

Answer 1

Ellipsoid.

Question 2

What is the circumference of the earth in nm?

Answer 2

21,600nm

Question 3

What is the circumference of the earth in km?

Answer 3

40,000km

Question 4

What must you multiply nm by to get km?

Answer 4

1.852

Question 5

How many minutes in a degree?

Answer 5

60

Question 6

What is a nautical mile?

Answer 6

1 minute around the circumference of the earth.

Question 7

What is the diameter at the equator?

Answer 7

6888nm

Question 8

What is the diameter at the poles?

Answer 8

6865nm

Question 9

Orient and easter

Question 10

You always drift from blank to blank.

Answer 10

Heading to track

Question 11

What is an isogonal?

Answer 11

Lines joining points of equal magnetic variation.

Question 12

What does agonic mean?

Answer 12

Lines joinging points of zero variation.

Question 13

What is variation?

Answer 13

Difference between true north and magnetic north.

Question 14

Whats deviation?

Answer 14

Difference between magnetic north and compass north.

Question 15

Whats a graticule?

Answer 15

Where lines of latitude and longitude meet at 90 degrees.

Question 16

The value for variation changes with…

Answer 16

Time

Question 17

The inclination of the Earth’s spin axis in relation to the plane of rotation around the Sun is the cause of the variable amount of (1) _____ and the changing duration of (2) _____ throughout the year at mid and high latitudes.

Answer 17

Insolation - daylight