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QuizQ & A

Junior NavigationJunior NavigationChapter 5Chapter 5

Celestial CoordinatesCelestial Coordinates

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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]

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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°

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3. All meridians of longitude and parallels of latitude are great circles.

a. True

b. False

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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

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Q7Q7

End OfEnd Of Quiz Q & A Quiz Q & A

Junior NavigationJunior NavigationChapter 5Chapter 5

Celestial CoordinatesCelestial Coordinates