the sun is a clock and a compass

Strip a photo of its GPS and it still leaks two things about where it was taken: latitude and time of day. Both are hidden in plain sight, in the length and direction of every shadow.

The sun rises in the east and sets in the west only loosely; the precise path depends on the day of the year and your latitude. Near the equator the midday sun climbs almost straight overhead, so shadows are short and stay short all year. Move toward the poles and the midday sun hangs lower in the sky, stretching shadows long even at noon. A photo of a long midday shadow, then, is a quiet vote against the tropics.

Direction is the second tell. In the northern hemisphere the sun tracks through the southern sky, so shadows lean north at midday; south of the equator the reverse is true. A single clear vertical — a pole, a person, a building edge — gives you the compass, and the compass gives you the hemisphere.

This is exactly the kind of cue our vision model is trained to weigh alongside signage and vegetation. None of it is decisive alone. Stack a long midday shadow, a left-hand traffic marking, and a northern-hemisphere compass, and the map shrinks fast — the way a good geoguesser's always did, one weak signal at a time.

It's also why honesty matters: a shadow only ever says "somewhere north" or "roughly 40 degrees." A tool that turns that into a confident pin is doing you a disservice. We'd rather hand you the shadow and let it whisper.