Sunrise at 20º S = 06:18 LMT on 21 August
Sunrise at 30º S = 06:28 LMT on 21 August
Therefore, Sunrise at 21º S = 06:19 LMT on 21 August
Arc to Time Conversion to UTC
= 175º 07’ W
= 11 Hours 40 minutes 28 seconds (We can ignore the 28 seconds)
= 06:19 + 11 hours 40 minutes
= 17:59 UTC
Standard Time Conversion = UTC + 13
= 17:59 + 13
= 30:59 (This cannot be achieved as it is greater than 24 hours therefore must take place the following day)
= 06:59 ST on 22 August