A Sundial that Shows Solstice

Standard

Explanation: What day is it? If the day — and time — are right, this sundial will tell you: SOLSTICE. Only then will our Sun be located just right for sunlight to stream through openings and spell out the term for the longest and shortest days of the year.

from Pocket https://apod.nasa.gov/apod/ap170621.html
via IFTTT

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