November 12, 2003
This photo was made during nautical twilight -- 45 minutes before sunrise. The long exposure (8 seconds), is partially responsible for this interesting color effect. Although it was still rather dark at ground level, the city lights of Colorado Springs (approximately 10 miles or 16 km distant) provided sufficient light to illuminate these altocumulus clouds. The view is to the east, so where the sky is blue on the photo, it was, in fact, a deep indigo blue. Photo details: f/2.8; ISO 400 16mm lens.