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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Star CN with DSLR Camera
From: Sean C
Date: 2016 Jan 28, 23:51 -0800
From: Sean C
Date: 2016 Jan 28, 23:51 -0800
Bill and Greg,
Out of curiosity, I tried using Adobe Photoshop to measure the pixels. It has movable horizontal and vertical guides that I placed on the upper, lower, right and left limbs. I then split the differences between those guides and put two new guides at the center of the square they formed (one vertical, one horizontal giving me a set of crosshairs at the center). Next, I used the convenient ruler tool to measure the pixels from the crosshairs to the horizon. The result after all that: 2,402.5 pixels (apparently PS can acheive sub-pixel accuracy!). Using Greg's corrections, I get an Ho of 22°18.0'; an intercept of 0.9' away. In other words: roughly the same result. ;)
Cheers,
Sean C.
