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

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

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

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 + 360° Sub-total 550°01,8’ Substract GHA Aries - 291°17,4’ SHA Sirius 258°44,4’ GHA Star = SHA Star + GHA Aries

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) + 76°56,3’ GHA Star 76°56,3’ Add + 360° Sub-total 436°56,3’ SHA Star - 243°42,7’ GHA Aries 193°13,6’ As GHA Aries is 193°13,6’ Longitude (W) - 76°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'?

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

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.

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

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

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

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