Paper 4

SECTION – A                       CELESTIAL NAVIGATION            (40 Marks)

QUESTION NO 1 IS COMPULSORY. ATTEMPT ANY THREE  FROM THE REMAINING. ALL QUESTIONS CARRY EQUAL MARKS.

1. Define following with sketch:-
2. i)   Celestial Longitude    ii)    Equation of Time                      (10 Marks)

 

2. On 30^th April 2008, in DR 00⁰ 20’ N 60⁰ 12’W, the sextant altitude of the Sun’s UL East of the meridian was 44⁰4’ when the GPS clock showed 01h 00m 52s. . If t IE was 3.1’ off the arc and HE was 20 m,  find the longitude by means of Longitude by Chronometer method and the direction of PL.                                                                                            (10 Marks)

 

3. On 1^st Sept 2008, before Noon at ship in DR 18^o 00’N 178^o 11’E, the sextant altitude of the Pole star was 18^o4’at 05h 21m 08s by chronometer (error 01m 18s slow). HE = 12.5m. IE = 1.6’on the arc.  Find the direction of the LOP and a position through which to draw it.(10 Marks)
4. On 23^rd Sept 2008, in DR 23^o 40’N 161^o 56E, the sextant meridian altitude of the Sun’s lower limb was 66^o6’. If IE was 2.3’on the arc and HE was 10.5m, find the latitude and the LOP.                                          (10 Marks)

 

5. On 30^th April 2008, in DR 00^o 20’N 60^o 12’W, the sextant  altitude  of  the

Sun’s UL East of the meridian was 44^o 13.4’when the GPS clock showed          12h 00m 52s.  If IE was 3.1’off the arc and HE was 20m, find the intercept and the direction of the LOP.                                                          (10 Marks)