Exercise 14

 

1. On 30^th April 1992, PM at ship in DR 34⁰ 18’S 40⁰ 20’W, the observed altitude of the star SIRIUS was 57⁰7’ at 08h 52m 05s chron time. The chron error was 01m 40s fast at 06 GMT on 16^th April and its daily rate was 4s losing. If HE was 21m, find the direction of the PL and a position through which it passes.

Solution –

2. On 19^th Jan 1992, at about 1900 at ship in DR 00⁰ 02’N 170⁰ 50’E, the sextant altitude of the star BETELGEUSE was 43⁰1’ when the chron (error 01m 18s fast) showed 07h 35m 02s. If HE was 18m and 1.3’ off the arc, required the direction of the PL and a position through which it passes.

Solution –

3. On 29^th Nov 1992, AM at ship in DR 25⁰ 30’S 107⁰ 20’W, the sextant altitude of the star RIGEL was 35⁰3’ when the chron (error 02m 50s fast) showed 11h 32m 10s. If IE was 0.9’ off the arc and HE was 12m, find the direction of the PL and a position through which to draw it.

Solution –

4. On 31^st Aug 1992, AM at ship in DR 40⁰ 30’N 64⁰ 56’E, the sextant altitude of the star DIPHDA was 21⁰4’ when the chron (error 01m 06s fast) showed 00h 21m 32s. If IE was 0.9’ off the arc and HE was 9m, find the direction of the PL and a position through which it passes.

Solution –

5. On 22^nd Sept 1992, PM at ship in DR 60⁰ 10’N 92⁰ 27’E, the sextant altitude of the star ARCTURUS was 25⁰ 01’ when chron (error 05m 01s slow) showed 00h46m 31s. If IE was 0.2’ on the arc and HE was 17m, find the direction of the PL and the longitude where it crosses the DR lat.

Solution –