1 Quiz Q & A Junior Navigation Chapter 5 Celestial Coordinates

2 1. The coordinates of the GP of the sun are L 7° 09.5' S, Lo 150° 04.2' E. a. What are the GHA and declination of the sun at this time? GHA = 209° 55.8' [GHA = 360° - LoE] Dec = 7° 09.5'S b. If the LHA of the sun at the same time is 48°32.1' what is the observer's Lo? Lo = 161°23.7' W [LoW = GHA - LHA]

3 2. You have determined your position by GPS to be L 23° 01.8' N, Lo 76° 56.3'. You look up and see the sun directly overhead. What are the Declination, GHA, and LHA of the sun at this time? Declination of the sun 23° 01.8'N GHA of the sun 76°56.3' LHA of the sun 000°

4 3. All meridians of longitude and parallels of latitude are great circles. a. True b. False

5 4. Fill in the blanks in the following statements about celestial coordinates: a. __________is the angular distance of the GP of a body north or south of the equator. b. ___________________is the angular distance from the Greenwich meridian westward to the hour circle of a body. c. ______________ is the angular distance from an observer's local meridian westward to the hour circle of a body. Declination Greenwich Hour Angle Local Hour Angle

6Q7 End Of Quiz Q & A Junior Navigation Chapter 5 Celestial Coordinates