Great circles (23-05-18) Flashcards

1
Q

What is a great circle?

A

a circle around the earth with radius and centre matching that of the Earth.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is a small circle?

A

Any circle that is not a great circle.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How many great circle options do antipodal points have?

A

infinite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is a loxoddrome/loxodromic line?

A

A rhumb line from the equator to a pole, which causes a spiral track.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a rhumb line?

A

A line connecting 2 positions that crosses all meridians at the same angle relative to north.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When comparing rhumb lines and great circles, which is always closer to the nearest pole?

A

A great circle.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

When do great circles and rhumb lines intersect?

A

At the equator.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is geocentric latitude?

A

latitude measured at the centre of the earth from the equator.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is geodetic/geographic latitude?

A

latitude measure at a point off set from the centre of the earth which intersects the earths surface at 90degrees, due to the elliptic profile of the Earth.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where is the maximum difference between geodetic and geocentric latitudes found, and what is the maximum difference?

A

it is found at 45degN/S and the difference is 11.6’ of arc.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

At what latitude is the arctic circle found?

A

66.5degN

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

At what latitude is the Tropic of Cancer found?

A

23.5degN

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

At what latitude is the equator found?

A

00degN/S

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

At what latitude is the Tropic of Capricorn found?

A

23.5degS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

At what latitude is the Antarctic circle found?

A

66.5degS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is a change in lat referred to as?

A

Chlat.

17
Q

Where is the prime meridian found?

A

000degE/W

18
Q

In terms of longitude, what makes up a great circle?

A

a meridian and its corresponding antimeridian.

19
Q

What is the change in longitude referred to as?

A

Chlong

20
Q

What is the intersection between lines of latitude and longitude called?

A

A graticule

It is always a 90 degrees intersection

21
Q

What 3 conditions are required in order to do basic distance calculations based on positions via longitude/latitude?

A

1- The positions on different latitudes bu the same longitude

2- the positions are on the equator on different longitudes

3 - the positions are on the same latitude and on meridians that are opposite each other (Polar transit)