POLARIS
From the following observations of Polaris obtain the direction of the position line and a position through which it passes.
1. Time at ship: Morning twilight. D.R. Lat: 43° 18’N Long: 34° 15’W
Date at ship: 24th March 1995. Chronometer reading: 7h 28m 34s
Sextant Altitude: 42° 53.5’ Chronometer error: 2m 20s fast
Index Error: 1.4’ off the arc. Height of eye: 12.2m
2. Time at ship: Morning twilight. D.R. Lat: 37° 52’N Long: 153° 33’E
Date at ship: 27th May 1995. Chronometer reading: 5h 50m 15s
Sextant Altitude: 38° 09.0’ Chronometer error: 5m 10s slow.
Index Error: 1.5’ off the arc. Height of eye: 13.8m.
3. Time at ship: 0530 hrs. D.R. Lat: 18° 15’N Long: 93° 20’E
Date at ship: 25th April 1995. Chronometer reading: 11h 28m 47s
Sextant Altitude: 18° 11.8’ Chronometer error: 4m 13s fast.
Index Error: Nil. Height of eye: 8.7m.
4. Time at ship: Evening twilight. D.R. Lat: 59° 57’N Long: 13° 12’W
Date at ship: 10th September 1995 Chronometer reading: 7h 58m 56s
Sextant Altitude: 59° 43.0’ Chronometer error: 0m 43s fast.
Index Error: 2.0’ off the arc. Height of eye: 8.0m.
5. Time at ship: Evening twilight. D.R. Lat: 49° 48’N Long: 14° 15’W
Date at ship: 26th November 1995. Chronometer reading: 5h 42m 00s
Sextant Altitude: 49° 43.0’ Chronometer error: Nil.
Index Error: 3.6’ off the arc. Height of eye: 4.2m.
6. Time at ship: Evening twilight. D.R. Lat: 35° 53’N Long: 178° 35’W
Date at ship: 18th May 1995. Chronometer reading: 7h 25m 48s
Sextant Altitude: 35° 29.8’ Chronometer error: 3m 27s slow.
Index Error: 1.1’ off the arc. Height of eye: 12.6m.
dariusz.lipinski