12-20-2015, 12:41 AM
An advantage of the 2102-d combined with knowing GHA Aries beginning at an hourly interval is that an increase of 15 degrees per hour will show the stars for the night without the need to recalculate GHA Aries precisely. Just turn the wheel 15 degrees each hour and the stars are presented.
Of the USNO Navigational Star chart I simply use dividers set to 90 degrees (from the chart) and swing the dividers around from my Latitude (declination) at Aries (360- SHA) to show the stars that are visible.
Larry
Of the USNO Navigational Star chart I simply use dividers set to 90 degrees (from the chart) and swing the dividers around from my Latitude (declination) at Aries (360- SHA) to show the stars that are visible.
Larry