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Navigation > Form Of The Earth 02 > Flashcards

Form Of The Earth 02 Flashcards

1
Q

What shape is the earth?

A

Oblate Spheroid

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2
Q

What is a great circle?

A

A circle drawn on the surface of the earth whose radius and centre arc are the same as the earth’s (the equator)

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3
Q

What is a small circle?

A

A circle drawn on the Earth’s surface whose radius and centre arc are not the same as the earth’s

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4
Q

What is the equator?

A

A great circle whose plane is perpendicular to the Earth’s axis of rotation and which divides the earth into two

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5
Q

What are meridians?

A

A semi-great circle joining the pole

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6
Q

What is a rhumb line?

A

A regularly curved lines on the surface of the earth that cuts all meridians at the same angle

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7
Q

How many nm in a degree?

A

60

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8
Q

How many nm in a minute?

A

1

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9
Q

List the quadrantal points

A

045 (NE)
135(SE)
225(SW)
315(NW)

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10
Q

What is a nautical mile (NM)?

A

The length of arc of a great circle that subtends an angle of one minute at the centre of the earth
(Assuming the earth is a sphere)

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11
Q

What is a Kilometre (KM)?

A

Generally accepted as one 10,000th of the average distance between the equator and either pole.

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12
Q

What is a Foot?

A

No relationship with any Earth dimension. Used for Vertical Navigation.

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13
Q

How many KMs in 1 NM?

A

1nm=1.85km

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14
Q

How many metres/centimetres in a foot?

A

1ft=0.3048m

1ft=30.48cm

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15
Q

How many feet in 1 NM?

A

1nm=6080ft

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16
Q

How many feet in a statue mile?

A

1 mile=5280ft

17
Q

How many feet in a Kilometre(KM)?

A

1KM = 3280ft

18
Q

What do you multiply NM by to find KM?

A

X 1.852

19
Q

What do you multiply KM by to get NM?

A

X0.5396

20
Q

What do you multiply NM to get Statue miles?

A

X1.15

21
Q

What do you multiply feet by to get metres?

A

X0.3048

22
Q

What do you multiply Metres by to get to feet?

A

X3.2808

23
Q

41nm equals how many KMs?

A

76

24
Q

41 miles = how many KM?

A

66 KM

25
Q

66nm= how many statue miles?

A

76

26
Q

Where is the earth flattest? And where is it widest?

A

On the polar regions

At the equator by 40nm

27
Q

The length of ____of a _______\______that subtends an angle of ______minute at the centre of the earth
(Assuming the earth is a sphere)

A

Arc
Great/circle
One

28
Q

What is an anti meridian?

A

The opposite of a meridian

29
Q

What is the circumference of the earth?

A

21,600nm

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