Paper 8

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Section – A (Celestial Navigation) Marks:45
Note: Question No. 1 is Compulsory and Carries 15 marks. Answer any Three of the remaining Four, each carry 10 marks.
Q. 1 (a) Sketch and Define the following: (10 marks)
(i) Greenwich Hour Angle (GHA)
(ii) Local Hour Angle (LHA)
(iii) Sidereal Hour Angle (SHA)
(iv) Prime Vertical
(v) Ecliptic
(b) Explain the importance of “Zone Time” on ships. (5 marks)
Q. 2 On 23rd Sept. 1992, in DR 23° 40’N, 161°56E, the sextant meridian altitude of the Sun’s lower limb was 66° 10.6’. If IE was 2.3’ ON the arc and HE was 10.5m, find the latitude and the PL. (10 marks)
Q. 3 Given Sextant Altitude of Sun’s LL 27° 03.2’, I.E. 1.4’ OFF the arc., H.E. 10.1m, on 5th March 1992. Find the True Altitude of the Sun, after applying each correction separately. (10 marks)
Q. 4 Calculate the LHA of a Star, whose RA is 70°, for an observer in longitude 47°E, when
(10 marks)
Q. 5 Explain “Local Mean Time” and “Standard Time”. What is the relationship between GMT and LMT with respect to Longitude? (10 marks)