Summer Night in Lee Vining

A sunset and the night sky, from my favorite campsite in Lee Vining, that great little town overlooking Mono Lake:

 Lee Vining sunset

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Stars over Lee Vining

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Stars over Lee Vining

See the North Star? (Brightest one between the two trees at left.)

Exposure: 21 sec, f/3.3, ISO 4500. Using a 20 mm lens (on a camera with a “full frame” 24×36 mm sensor), there’s virtually no detectable star movement in 20 seconds, or even in 30 seconds if you’re facing north. At 30 seconds the stars become very short streaks in other directions. Why is that? Stars move slower through any given angle (or time interval) toward the celestial poles; faster (therefore farther) toward the celestial equator.

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Tim Messick Photography • Graphics
Copyright © 2013 Tim Messick. All rights reserved.

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About Tim Messick

Photographer, cartographer, and botanist/naturalist. Home is in Davis, California. Home-away-from-home is the eastern Sierra Nevada. Compiling a flora of the Bodie Hills.
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