Quote:
Let's say you build a tracker with a 20TPI 1/4" whitworth rod and a 10 inch arm radius, every turn of the nut advances the arm by
206265 ÷ 20 TPI ÷10 inch = 1031 arc sec per turn of the nut. But the sky only moves at 15.04 arc sec per sec. So you need to turn the nut at 1 turn every 68.6 seconds.
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Where does the figure of 206265 come from?