EXERCISE 35 – LATITUDE BY MERIDIAN ALTITUDE STAR (Numerical Solution)

1.  On 04TH March 2008 AM, in DR 45˚ 10.0’ N 120˚ 30.0’ W, the sextant meridian altitude of the Star ANTARES was 18˚ 26.2’. If IE was 3.2’ off the arc and HE was 10m, find the latitude and state the direction of the PL (LOP). Calculate the GMT of meridian passage.Screenshot (112)      Screenshot (119)
2.  On 12TH Sept 2008, DR 43˚ 05.0’S 072˚ 20.0’ E, the sextant meridian altitude of the Star ALDEBARAN was 30˚ 40.2’. If IE was nil and HE was 18m, required the latitude, LOP, the GMT of meridian passage.Screenshot (113)
3.  On 22nd Sept 2008 in DR longitude 090˚ 06.0’ E, the observed altitude of the Star RIGEL on the meridian was 73˚ 24.2’ North of the observer. If HE was 15m, find the latitude, LOP and the GMT of meridian passage.
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NOTE:

The time interval between any two successive meridian passages of Ȣ is one sidereal day which is equal to 23h 56m 04s. hence, one sidereal day is added or subtracted as appropriate to ensure that the meridian passage is correct for the ship’s date.

4.On 20th Jan 2008 in DR 57˚ 31.0’ N 164˚ 20.0’ W, the sextant meridian altitude of the Star DIPHDA was 14˚ 33.7’. If IE was 0.6’ on the arc and HE was 14.5m, find the latitude, LOP and the GMT of meridian passage.
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Screenshot (117)

5.  On 01st May 2008 in DR 30˚ 18.0’ N 135˚ 02.0’ W, the sextant meridian altitude of the Star REGULUS was 71˚ 46.9’. If IE was 2.4’ on the arc and HE was 14m, find the latitude and state the direction of the PL (LOP). Calculate the GMT of meridian passage.Screenshot (118)Screenshot (119)

manas NIRENWAL

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