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Taking Sights and Finding Ho, LHA and Dec Quiz

Test your knowledge on parallax corrections, SHA calculations, and more in this Global Navigation Chapter 3 quiz. Answer questions on celestial navigation concepts.

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Taking Sights and Finding Ho, LHA and Dec Quiz

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  1. TakingSights and Finding Ho, LHA and DecQuiz 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+ 360° Sub-total550°01,8’ SubstractGHA Aries- 291°17,4’ SHA Sirius 258°44,4’ GHA Star = SHA Star + GHA Aries

  5. Question 4 SHA Star + GHA Aries = GHA Star – Lo West = LHA Star. LHA Star iszero as Pollux has transitedyourmeridian. Longitude is 076°56,3’W. LHA Star 0° Lo(W) +76°56,3’ GHA Star76°56,3’ Add + 360° Sub-total436°56,3’ SHA Star -243°42,7’ GHA Aries193°13,6’ As GHA Ariesis 193°13,6’ Longitude (W) - 76°56,3’ LHA Aries116°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. TakingSights and Finding Ho, LHA and DecQuiz End of Global Navigation Chapter 3

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