The sun's geometry
The 37° line
The 37° line is the latitude below which a building's sunniest side switches from south to north for part of the summer.
Nearer the equator than that, the early-summer sun hangs in the north-east and north-west long enough to beat the south face — 15 days a year in Las Vegas, 191 in Nairobi, never in Chicago.
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.
The 37° line, 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 solar noon. Slide through the day, or drag the sky to turn it.
How Sol measures it.
The study sampled the sun's position every four minutes of every day of the year for 82 cities, on a vertical pane facing each of eight points, clear sky and open horizon. South glass is the sunniest in 69 of them and north glass in 12; between them the switch appears wherever midsummer sunrise and sunset stand far enough north of east and west, which is a matter of latitude alone.
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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