Eretz Yisrael Clock
An Eretz Yisrael Clock is a clock which is reset to 12:00 at sundown every day. It was used by the Old Yishuv and is still used by certain groups in the Meah Shearim, and Geula neighborhoods of Jerusalem; as well as in Ramat Beit Shemesh and Safed.
Source: Wikipedia
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