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Light Lab 39.46° N, 82.63° W, 40 mi from Columbus, United States

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Light Lab · the evening of Jan 31 from 39.46° N, 82.63° W, looking WSW

Sunset

5:34 pm

Sun 1.9°Light about 3,300 KShadows ×30

Golden 5:10 pmSunset 5:34 pmDark 6:18 pm

Shadows

×5×10NESW

Pointing east-northeast, 30 times as long as what casts them.

How high the sun is

GoldenBlueLevel horizon4:40 pm6:38 pm

The color of the light

Daylight ~5000 KSunset ~2600 KBlue hour ~10,000 K

The sun is down but the sky still glows: soft, even, rosy light.

Starting settings, when it matters

5:10 pm–5:34 pm · golden

Daylight white balance (about 5500 K) keeps the warmth. Meter the sky beside the sun, not the sun.

5:34 pm–6:07 pm · afterglow

6:07 pm–6:18 pm · blue

Tripod. f/8, ISO 100, about 2 s to start, 8 s by the end. Daylight white balance keeps the blue.

Terrain: Mapzen terrain tiles (SRTM and others)

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