Junior Navigation Chapter 9: Meridian Transit of the Sun Quiz

1. Meridian Transit of the Sun Quiz Q & A Junior Navigation Chapter 9

2. 1. If you are at Lo 150° 00.0'W , your apparent time and mean time will always be the same. a. True b. False Why? Mean time is determined by the position of the mean sun, and apparent time is determined by the position of the apparent sun

3. 2. Meridian transit of the sun occurred at ZT 1212 at Lo 47° 00.0'W. What was the GHA of the sun at ZT 1200? GHA of sun @ ZT 1200 = 44° 00.0' Recall that GHA of the sun increases by 1° each 4 minutes of time. At ZT 1200 it was 12 minutes prior to meridian transit.

4. 3. You determine the Ho of the sun to be 37° 24.8' at meridian transit, and determine the declination of the sun at this time is 10° 14.8'S. You are north of the sun. What is your latitude? Latitude = 42° 20.4'N Recall @ Meridian Transit, Lat = CoAlt +Dec CoAlt = 90° - 37° 24.8' = 52° 35.2’N (you are north of the sun) Lat = 52° 35.2’N +10° 14.8'S = 42° 20.4'N

5. 4. The observed altitude Ho, is subtracted from 90° to obtain Co-Altitude. a. True b. False

6. 5. Latitude is the sum of declination (N or S) and Co-altitude. a. True b. False

7. Q7 Meridian Transit of the Sun End Of Quiz Q & A Junior Navigation Chapter 9