ERSA time calculations

Question 1

Find the beginning of daylight for Brisbane on Christmas day.

Answer 1

1. Lat is 27°23’00” S plot that of chart with 25 December
   = 0437 LMT
2. Long is 153°07’00” or 153° either divide by 15 or use chart
   = 10 hr 12 mins
3. 0437 LMT - 10 hr 12 mins = 24 December 18:25 UTC
   + 10 hr = 250425EST

Question 2

Find the end of daylight time for Oodnadatta on 15th June in Local Standard Time

Answer 2

1. LMT is 151737 (from chart AIP GEN 2.7)
2. Arc to Time is 9 hrs (135°) and 2 mins (27’)
   = UTC 150835
3. Add 9.5 hours for CST = 151805

Question 3

You want to fly from Port Hedland to Adelaide on June 30th.

How many hours of daylight are available to you ?

Answer 3

BOD Port Hedland UTC 292218
EOD Adelaide UTC 300811
= 9 hrs and 53 minutes

Question 4

The end of daylight in Darwin on 18th August is closest to:

(in UTC)

Answer 4

UTC 0932

Question 5

Earliest departure time for a VFR flight from Sydney on August 18th is closest to ?
(in UTC)

Answer 5

172005 UTC