The sun's geometry
Shadow length
Shadow length is an object's height divided by the tangent of the sun's altitude, so it grows as the sun sinks.
Sol draws it to scale for any object, any hour, and points it the way the shadow falls.
Golden hour, the twilights and the moon, where you stand.
Sol for iPhone is coming soon, with each of them for the place you stand, on your phone and your wrist.
Shadow length, where you stand.
You stand at the middle of your horizon. The dots are the sun’s path today, warm where the light turns golden; the stage opens at this minute. Slide through the day, or drag the sky to turn it.
How Sol measures it.
The ratio depends on altitude alone; the direction is opposite the sun's azimuth. At 45° a pole casts its own height; at 10° nearly six times it — which is the arithmetic behind winter shadows and the reach of sunlight into a room, and why the same window is a different room in January.
Make time for the light.
Sol for iPhone is coming soon, with golden hour, the twilights and the moon for wherever you stand. Leave your address for early access and one email when it ships.
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