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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: celestial accuracy
From: Bill Murdoch
Date: 1999 Oct 30, 6:26 PM
From: Bill Murdoch
Date: 1999 Oct 30, 6:26 PM
In a message dated 10/30/99 1:35:27 AM Eastern Standard Time, 71202.2014@COMPUSERVE.COM writes: > I wonder how one goes about > measuring dip at sea. The only method that occurs to me is to set up > a theodolite on shore, oil rig or other steady platform and measure > the sea horizon with respect to the spirit bubble. Would a sextant-like instrument that could measure the angle between the horizon ahead and the horizon behind do the trick ? Something you would look into and line up one horizon with the other. Half the difference between the measured angle and 180 degrees would be the dip. Bill Murdoch
