Mauna Kea Sky Shadow

Today’s Astronomy Picture of the Day features a view of Mauna Kea’s shadow on the sky, just at the tail end of last week’s lunar eclipse:

Mauna Kea Shadow from APOD (photo by Alex Mukensnable)

I couldn’t help but be reminded of our visit to the summit in April 2005, just at sunset, when I took this similar (but decidedly less cool) photo:

Atmospheric Optics explains why most mountains’ shadows look triangular when viewed from their summits.

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