On the equinox, the path of the tip of a sundial shadow is a straight line. Monumental sundials are sometimes positioned such that this line points to key landscape features–in the Augustus Sundial in Rome (previous post here), the obelisk-gnomon was positioned so that on the equinox this line intersected Augustus’s mausoleum.
The Long Island City Sundial is positioned such that this equinox line intersects the United Nations, across the river in Manhattan, at about 8:00am.
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