At what degree below the horizon is:
1-civil twilight
2-nautical twilight
3-astronomical twilight
1-0° - 6°
2-12°
3-18°
What is the local hour angle of the mean sun at 1200 LMT
000
Does the date increase/decrease when crossing the International Date Line on a Westerly heading
Increase
Does the date increase/decrease when crossing the International Date Line on a Westerly heading
Increase