Understanding Time

Question 1

UTC is

Answer 1

Universal Co-ordinated Time

Question 2

Earth travels 360° per solar day or ______ per hour or 1 ° every _______ minutes.

Answer 2

15° hour
1° minute

Question 3

How can I find the time if I know the location’s long + lat and UTC?

Answer 3

Divide by 15 this is called ‘arc to time’ conversion

EG. 148°E is 9.86 or 9 hours and 52 minutes

Question 4

Time before sunrise and after sunset where there is adequate light for flying is called _______ _______ and is when the sun is ___ ° of the observers horizon.

Answer 4

civil twilight
6°

Question 5

What is the method for calculating BOD time for an airport ?

Answer 5

1. Using latitude and date plot on a ‘BEGINNING OF DAYLIGHT’ chart.
2. Using this time we need

Question 6

During summer in Australia, in what direction from the departure aerodrome will the end of daylight [in LMT] be earlier ?

north, south, east or west ?

Answer 6

If the end of daylight is earlier the days are getting shorter. Which direction do you have to travel in summer to find shorter days ?

North

The days become longer as you go south in Summer. If you go far enough south in summer it would be daylight 24 hours a day !!

Question 7

During winter in the southern hemisphere the LMT of EOD would occur earlier at the destination than the departure point for a flight which travels…

north, south, east or west ?

Answer 7

South

As you travel south in winter in the southern hemisphere, the days get shorter and the nights get longer. This is due to the inclination of the earth’s axis to the plane of its orbit about the sun.