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A projection clock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face or display on any surface usable as a projection screen, most often the ceiling. [1] The clock can be placed almost anywhere if only the projected image must be seen.
An astronomical clock, horologium, ... The projection point for the stereographic projection is the North pole; on astrolabes the South pole is more common.
For example, Richard of Wallingford's clock (c. 1330) consisted essentially of a star map rotating behind a fixed rete, similar to that of an astrolabe. [39] Many astronomical clocks use an astrolabe-style display, such as the famous clock at Prague, adopting a stereographic projection (see below) of the ecliptic plane. In recent times ...
Up first is the new +ECO Solar Projection Clock, which is equipped with a detachable solar panel and an integrated projector that beams the time out onto a nearby wall. Second, we've got the ...
In 1348, Giovanni Dondi built the first known clock driven mechanism of the system. It displays the ecliptic position of the Moon, Sun, Mercury, Venus, Mars, Jupiter and Saturn according to the complicated geocentric Ptolemaic planetary theories. [11] [12] The clock itself is lost, but Dondi left a complete description of its astronomic gear ...
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