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Nautical Publications
INSTRUCTIONS FOR USE
1. From the Almanac, determine GHA (ARIES) for the time of observation.
2. Add Longitude East, or subtract Longitude West, to obtain LHA
3. Select the template for the latitude nearest to the position of the observer and place it on the star diagram. Ensure that the correct side of the star diagram is being used.
4. Orientate the template so that the arrow head points to the appropriate value of LHA on the outer graduated circle and the cintre lint 180°/360° of the template passes through the Pole of the chart with the centre cross on the latitude of the observer.
5. From the template, read off the approximate altitude and azimuth of any selected star, or determine the identity of a star for which altitude and azimuth is known.
