Notes from his website skysurvey.org:
The Photopic Sky Survey is a 5,000 megapixel photograph of the entire night sky stitched together from 37,440 exposures.
[...]
On a journey that covered 45,000 miles by air and 15,000 by land—the equivalent of nearly 2½ passes around the equator—I toured much of the American west and twice visited the western Cape of South Africa. Through it I was able to enjoy not only the wonders of the natural world but also the company of my retired father whom I was able to convince had nothing better to do
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