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//! Get flag for source twinkling.
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bool getFlagTwinkle() const {return flagStarTwinkle;}
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//! The limit is valid only at a given zoom level (around 60 deg)
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//! See http://en.wikipedia.org/wiki/Bortle_Dark-Sky_Scale
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//! Get the current Bortle scale index
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//! Get the magnitude of the currently faintest visible point source
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//! It depends on the zoom level, on the eye adapation and on the point source rendering parameters