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Re: Fw: Chichester's Calculations ( Sine-Cosine method)
From: Dave Walden
Date: 2008 Dec 15, 05:36 -0800
From: Dave Walden
Date: 2008 Dec 15, 05:36 -0800
Here's an HO 211 solution: Hearty thanks to (and check out his other great programs!): REM HO-211 SIGHT REDUCTION v3.9 REM 22 OCTOBER 2004 REM Copyright (C) 2004 by Stanley Adams, All Rights Reserved REM STANLEY ADAMS REM sadams16@yahoo.com REM www.geocities.com/sadams16 Give K the same name as Dec. K~L: Add K and Lat, if contrary name. Subtract smaller from larger, if same name. If t > 90� then take K from bottom of table (90�-180�). Take Z from bottom of table (90�-180�) except when K is same name as Lat and greater than Lat, then take Z from top of table (0�-90�). If Lat = N and t = E then Zn = Z If Lat = N and t = W then Zn = 360�-Z If Lat = S and t = E then Zn = 180�-Z If Lat = S and t = W then Zn = 180�+Z Lat > 0� is N, t > 0� is W Lat < 0� is S, t < 0� is E K and T angles within 8� of 90� cause inaccurate Hc, interpolate B(R) If A(Z) is negative when Z is near 90�, then interpolate B(Hc), or use zero Hc is below horizon if K~Lat > 90� PRESS ENTER TO CONTINUE ? LAT= 43�00.0'N, DEC= 20�06.0'N LHA= 339�00.0'W, T = 21�00.0'E A(Dec)= 46387.0 -B(R) = 2610.0 Interpolation OFF ----------- A(K) = 43777.0 ? K = 21�24.5'N +-Lat= 43�00.0'N ------------- B(K~L)= 3160.0 ? K~L= 21�35.5' +B(R) = 2610.0 ----------- A(Hc) = 5770.0 ? Hc =+ 61�07.0' A(t) = 1.1 +B(Dec)= 2729.0 ----------- A(R) = 47296.0 -B(Hc) = 31603.0 Interpolation OFF ----------- A(Z) = 15693.0 ? Z = N 135.8� E, Zn = 135.8� T Verify: Hc = 61�06.7', Z = 135.8�, Zn = 135.8� PRESS 'Y' TO CONTINUE E --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---