Curves
Place
6.2088° S · 106.8456° E · UTC+7
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Over one day the tip of a gnomon’s shadow traces a hyperbola — and on the equinoxes, exactly a straight line. Every ancient sundial was built around this family of curves.
The analemma: the sun’s position at the same clock time on every day of the year. The figure-eight is the equation of time, and the reason solar noon drifts from 12:00.