Sunrise and Sunset times are in Local Mean Time.

 

Arc to Time Conversion for 135°30'W

 

= 135.5 x 4 minutes

= 542 minutes

= 9 hours 2 minutes

 

Conversion is from East to West therefore subtract:

 

00:57 UTC on 21st January

09:02

 

15:55 LMT on 20th January