Each hour circle is labeled with the date on which it coincides with the meridian above the celestial pole at 8 p.m. local time.
For RA=0h, we find:
Thus at 8 p.m. on November 20 our horizon should look like this:
Since 1h of RA rotates by our meridian in one hour of time, at 11 p.m. on November 20 our horizon should look like this:
And three hours after that the stars we could see would be above the red line of the horizon.
Thus you can use your SC001 to display the visible stars using the little dates on the bottom, adjusted 1h of RA to the left for each hour after 8 p.m. or 1h of RA to the right for each hour before 8 p.m..
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