NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Refraction near th e Horizon – Observation vs. Calc ulation
From: Bruce J. Pennino
Date: 2013 Apr 5, 09:10 -0400
From: Bruce J. Pennino
Date: 2013 Apr 5, 09:10 -0400
Bruce
Thank you for posting this information. The text is
just excellent and well written. My math/statistics background limits me ,
but I'll study the results.
I was interested to see that you use the equation
for dip 1.76 sq rt H meters, which is the same as 0.971 sq rt H feet. I
gather that this is the universally accepted equation, which I've proven to
myself is from basic trig knowing the average radius of the earth?
Right?
Bruce
----- Original Message -----From: Marcel TschudinSent: Thursday, April 04, 2013 6:28 PMSubject: [NavList] Refraction near the Horizon – Observation vs. Calculation
The following link leads to a first, gross description of the collected measurements, their related data and to two examples showing how the dataset can be used. ( I hope my version of English is sufficently comprehensible.)The intention is now trying to find estimates for refraction and dip which agree even better with the measurements than those shown.
https://docs.google.com/document/d/1iTclXHZVFhHY9OtwX2V6unisf2lQbTA_gd54EyQWuq8/edit?usp=sharing
Comments, suggestions and critics are welcome.MarcelP.S: May be one understands now why I encourage members of NavList to compile a similar dataset with measured dips.: http://fer3.com/arc/m2.aspx?i=123335
