What's the name for the dial on a wristwatch or clock which rotates to display a sun symbol at midday and a moon symbol or or night scene at midnight?
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Antiquorum-Lexico.pdf, an “Illustrated Horological Glossary”, on page 134 (pdf page 13) apparently refers to that dial like that as a “Day/night” dial.
Astronomically-related terms elsewhere in the glossary's dial section include Astrolabe, p. 133; Moon phase and Planetarium, p. 136; Star chart and Sunrise, sunset, p. 137.
From Wikipedia : An astronomical clock is a clock with special mechanisms and dials to display astronomical information, such as the relative positions of the sun, moon, zodiacal constellations, and sometimes major planets.
So, I gess, you could call that an astronomical wristwatch or dial, as they do in the article.