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Re: Compass correction using sunrise
From: Andrés Ruiz
Date: 2022 Jun 30, 15:50 +0200
16/06/2022
08:14:43 UT1
48º 17.0' N
062º 28.0' W
Sun derivatives
dH/dt = 8.018169 º/h = 481.1 '/h = 0.13 '/s
dZ/dt = 11.193951 º/h = 671.6 '/h = 0.19 '/s
dDec/dt = 0.001445 º/h = 0.1 '/h = 0.00 '/s
dGHA/dt = 14.997691 º/h = 899.9 '/h = 0.25 '/s
As is shown in the document: dHdt dZdt.Sun.pdf, (other date/time and location), the change in azimuth dZ/dt is minimum during the rise and set, but of considerable value.
From: Andrés Ruiz
Date: 2022 Jun 30, 15:50 +0200
It is interesting to remark that in 5s of time the azimuth of the rising sun increases in nearly 1º.
08:14:43 UT1
48º 17.0' N
062º 28.0' W
Sun derivatives
dH/dt = 8.018169 º/h = 481.1 '/h = 0.13 '/s
dZ/dt = 11.193951 º/h = 671.6 '/h = 0.19 '/s
dDec/dt = 0.001445 º/h = 0.1 '/h = 0.00 '/s
dGHA/dt = 14.997691 º/h = 899.9 '/h = 0.25 '/s
As is shown in the document: dHdt dZdt.Sun.pdf, (other date/time and location), the change in azimuth dZ/dt is minimum during the rise and set, but of considerable value.
For magnetic compass total correction,
(deviation + variation),
I prefer to use the azimuth Zn formula rather than the Amplitude (H=0) one because I do not care about the little height above the horizon.
Fair winds.
-- File: 152863.dhdt-dzdt.sun.pdf
