A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2016 Sep 25, 11:35 -0700
How are you progressing with the Navigation 10" slide rule proto type? I have been doing sight reductions with a K&E 4070-3 and noticed that the ST scale ends at 35'. I think an additional ST scale continuing from 35' would be useful when doing the sine product (classic formula) when declinations or latitudes are less than 35'.
Of late good slide rule results (1' precision) have been obtained with the K&E 4070-3 on morning low altitude Sun obs. (below 15°) and evening twilight Venus below 15°. Low altitude stars have been reducing nicely also although not as precise (2' precision) when the azimuth is southerly. When very near the meridian it is quicker and more precise to switch to the ex-meridian reduction formula.
From: Bob Goethe
Date: 2016 Jan 24, 21:20 -0800