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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Tinyac on Linux
From: Sean C
Date: 2017 Apr 3, 16:36 -0700
From: Sean C
Date: 2017 Apr 3, 16:36 -0700
Bruce,
As Peter mentioned, there may be a discrepancy between MICA and Stellarium concerning Delta-T. I posted recently about the error MICA has accumulated.
By default, I believe Stellarium uses Espenak & Meeus' model. The user can select which algorithm Stellarium uses in the "Configuration" window, "Navigation" tab. There is even an option to use a user-defined equation.
As for MICA, one option is to look up the current predicted values on the USNO or IERS websites and adjust the requested UT1 time accordingly. (About -0.5 seconds.) Another option is to request output in TT and adjust for Delta-T "manually". (In other words, use the TT of the actual current UT1.)
Cheers,
Sean C.
