C2 Time

Question 1

How much does the local time change per degree of longitude?

Answer 1

Local time moves forward (Eastward) or backwards (Westward) by 1 hour every 15 degrees

So the local time changes by 4 minutes for every 1 degree

Question 2

What is the line called that separates 2 calendar days and lies on 180 degree EAST and 180 degrees WEST

Answer 2

The International Date Line

Question 3

The Earth’s tilt causes varying amounts of daylight and night across a meridian of longitude. What is the relationship between the amount of daylight u have as u move towards the equator?

Answer 3

The amount of daylight u have decreases as u move from the North Pole down towards the equator.

If the Earth did not have a tilt, the sun would rise and set at exactly the same time all across the meridian of longitude.

Question 4

What is the definition of night according to ICAO and the UK?

Answer 4

ICAO: From the end of evening civil twilight to the start of morning civil twilight

UK: 30 minutes after sunset to 30 minutes before sunrise

Question 5

What angle below the horizon is the centre of the sun’s disc is considered twilight?

Answer 5

When the centre of the sun’s disc is 6 degrees below the horizon

Question 6

What is dead reckoning?

Answer 6

Using previous headings, speeds and times to determine one’s present position

Question 7

What 3 factors determine local mean time of sunrise and sunset at a location?

Answer 7

Location’s latitude, elevation and time of year