Re: odd parking position discrepancy


Ray Gralak
 

Is "Resume from Present Position" (which is non-existent in APCC Standard) the same as "Resume from
Last Parked"?
Yes, that is correct.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro: http://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver
Author of PulseGuide: http://www.pulseguide.com
Author of Sigma: http://www.gralak.com/sigma


-----Original Message-----
From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
Sent: Wednesday, July 5, 2017 10:02 PM
To: ap-gto@yahoogroups.com
Subject: [ap-gto] Re: odd parking position discrepancy



Rolando

Is "Resume from Present Position" (which is non-existent in APCC Standard) the same as "Resume from
Last Parked"?

Bryan


---In ap-gto@yahoogroups.com, <chris1011@...> wrote :


The Park positions, especially Park1 and Park4, will never be exactly parallel to the earth. There are a number
of reasons for that, including the time it takes for the Dec axis to stop moving after the RA axis has gotten to
the park position. During the Dec slewing the RA will be tracking at the sidereal rate, so that at the end of the
park sequence it will be slightly off. The second reason is that atmospheric refraction is being applied so that
the RA and Dec positions will be slightly high.

For the above reasons, when you re-start the system next time, don't Resume from Park4, rather use the more
accurate Resume from Present Position. That is the most accurate way to start your mount after it has been
parked. The mount always keeps track of the slight differences on the actual position, so let it resume from its
internal known position. The only time I would ever use Resume from Park4 (or 1 or 2 etc.) is when starting
with a fresh setup where the internal mount positions are not known or where you have moved the scope via
loosening the clutches.

Rolando

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