The Depth of Shadow

As we move westward, the edge of night is revealed in swaths of umbral and penumbral shadows. The macro view is one of the terminator advancing demarcating the day as twilight softly rolls along the smooth face of a distant horizon…Looking deeper into the penumbra, we see the rough edges of earth, accentuated by deep shadows on the night side of sand dunes and mountains, the purple shadows of penumbra yielding to the indigo of umbra. Shadows within shadows amplify the warmth of the remaining light and bring a sense of depth and detail to the earth below.

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