The Gnomon

set your place & the date — drag the dial to move time

A real instrument, not a picture of one. The style (the gnomon's edge) is cut to your latitude so it points at the celestial pole; its shadow falls on hour-lines laid out in closed form for the dial type. Read off apparent solar time, then add the longitude offset, the equation of time, and DST — and the dial agrees with your wall clock to the minute.

Dial type

Latitude 40.0° N

Longitude 71.0° W

Time zone (std. meridian) UTC−5

Day of year Jun 20

Local clock 14:30

Equation of time (correct the dial) Daylight saving (+1 h)

Skin

Drag the dial left/right to move the clock. The bright wedge is the cast shadow; its tip rides the numbered hour-line. Toggle the equation of time and watch the civil readout snap onto the wall clock. Plot analemma traces a year of true noons — the figure-8.