11

QuizQ & A

Junior NavigationJunior Navigation

Chapter 9Chapter 9

Meridian Transit Meridian Transit of the Sunof the Sun

22

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

33

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.

44

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

55

4. The observed altitude Ho, is subtracted from 90° to obtain Co-Altitude.

a. True

b. False

66

5. Latitude is the sum of declination (N or S) and Co-altitude.

a. True

b. False

77

Q7Q7

End OfEnd Of Quiz Q & A Quiz Q & A

Junior NavigationJunior Navigation

Chapter 9Chapter 9

Meridian Transit Meridian Transit of the Sunof the Sun