Exercise-13

1. 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 2.8’ on the arc and HE was 12m, find the direction of the PL and a position through which to draw it.

Solution –

2. 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 00h 46m 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 –

3. 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 IE was 1.3’ off the arc, required the direction of PL and a position through which it passes.

Solution –

4. 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 51m 38s chron time. The chron error was 00m 10s slow at 12 GMT on 22^nd April and its daily rate was 3s gaining. If HE was 21m, find the direction of the PL and a position through which it passes.

Solution –

5. 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 nil) showed 00h 20m 26s. 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 –