1. Taking Sights and Finding Ho, LHA and Dec Quiz
Global Navigation
Chapter 3

2. Question 1 Parallax corrections for the moon are always positive.
A True
B False.

3. Question 2
The additional parallax correction for Venus can sometimes be negative.
A True
B False

4. Question 3
At a particular time, the GHA of Sirius is 190°01,8' and the GHA of Aries is 291°17,4'. What is the SHA of Sirius?
Thus, GHA Sirius = 190°01,8’
Add °
Sub-total °01,8’
Substract GHA Aries °17,4’
SHA Sirius °44,4’
GHA Star = SHA Star + GHA Aries

5. Question 4 SHA Star + GHA Aries = GHA Star – Lo West = LHA Star.
LHA Star is zero as Pollux has transited your meridian.
Longitude is 076°56,3’W.
LHA Star 0°
Lo(W) °56,3’
GHA Star 76°56,3’
Add °
Sub-total 436°56,3’
SHA Star °42,7’
GHA Aries °13,6’
As GHA Aries is 193°13,6’
Longitude (W) °56,3’
LHA Aries 116°17,3’
Your GPS position is L28°01,8' N, Lo076°56,3' W and Pollux has just transited your meridian.
What were the GHA and LHA of Aries at the time if SHA of Pollux was 243°42,7'?

6. Question 5
A star whose magnitude is +1,3 is brighter that a star whose magnitude is +0,6.
A True
B False

7. Question 6
The times of meridian passage of the sun and moon shown on the daily pages of the Nautical Almanac are given in what kind of time?
A Zone Time.
B Local Mean Time.
C Universal Time.

8. Question 7
During morning twilight, you should take sights on the fainter bodies first.
A True
B False

9. Question 8
If you take sights whose altitudes are less than 15°, you must make extra corrections for
atmospheric pressure and temperature.

10. Question 9
Altitude corrections for the moon are more complex than for other bodies.
A True
B False

11. Taking Sights and Finding Ho, LHA and Dec Quiz
End of
Global Navigation
Chapter 3