Saturday, September 13, 2014

found newer Polaris Finder

Stumbled across version 1.5 of Takahashi's polar finder tool. Back in July I had found version 1.2.

This newer version accommodates for use in the southern hemisphere, using sigma Octanis, in addition to Polaris. The outer circle of dashed lines (and outer tick marks) is for the southern celestial pole alignment; the inner solid circles is for NCP. I see it sports more detailed notes. Seems to check out with SkyTools 3 Pro.

The dates are set the same in each app. 25 Dec 2014 at 11:00 PM in ST3P; 26 Dec 2014 at 4:00 UT. The SkyTools Interactive Atlas chart is set to Horizon mode with the vertical and horizontal flip controls both on, generating a rotated view, i.e. a view rotated 180° as produced by a refractor telescope. I tried different dates and times. Different decades. Perfect correspondence.

The NJP documentation refers to the precession circles and scales. Points out that precession is covered from 1985 to 2015. I always like it when I see that they adjust for movement of the celestial pole.

I've noticed that the new "simple" reticules with drawn constellations, common in Synta 'scopes, do not.

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