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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Instumental error?
From: Alexandre Eremenko
Date: 2005 Apr 20, 20:40 -0500
From: Alexandre Eremenko
Date: 2005 Apr 20, 20:40 -0500
Bill, > I have two observations: > 1. It seems the SNO-T is a high-quality instrument. > If I recall, the specs > are plus/minus 10 seconds error along the arc (0.17'). > Unless you got a > dud, any value higher than 0.2' is highly suspect. Yes, I afraid it is a dud. > 2. Are you using the same star pairs when you get the 0.5', 0.6', > and 0.8' > values? I don't understand the question. On the same pair of stars the measurement are consistent. Stand dev is about 0.2' But you cannot measure substantially different distances with a same pair of stars. > Think we need to get together in a > more controlled setting with fresh eyes > and do some comparisons, Sure. I agree that more observations are necessary to develop a reliable table. So far it seems that only the very fact that such table is necessary is established. A