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2. Projection clock - Wikipedia

   en.wikipedia.org/wiki/Projection_clock

   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.

3. Vector projection - Wikipedia

   en.wikipedia.org/wiki/Vector_projection

   The vector projection (also known as the vector component or vector resolution) of a vector a on (or onto) a nonzero vector b is the orthogonal projection of a onto a straight line parallel to b. The projection of a onto b is often written as proj b ⁡ a {\displaystyle \operatorname {proj} _{\mathbf {b} }\mathbf {a} } or a ∥ b .

4. Roman numerals - Wikipedia

   en.wikipedia.org/wiki/Roman_numerals

   A clock face with the Roman numerals typical for clocks, in Bad Salzdetfurth, Germany While subtractive notation for 4, 40 and 400 ( IV , XL and CD ) has been the usual form since Roman times, additive notation to represent these numbers ( IIII , XXXX and CCCC ) [ 9 ] continued to be used, including in compound numbers like 24 ( XXIIII ), [ 10 ...

5. Clock face - Wikipedia

   en.wikipedia.org/wiki/Clock_face

   Longcase clocks (grandfather clocks) typically use Roman numerals for the hours. Clocks using only Arabic numerals first began to appear in the mid-18th century. [citation needed] The clock face is so familiar that the numbers are often omitted and replaced with unlabeled graduations (marks), particularly in the case of watches. Occasionally ...

6. Roman timekeeping - Wikipedia

   en.wikipedia.org/wiki/Roman_timekeeping

   A Roman era sundial on display at a museum in Side, Turkey. The Romans used various ancient timekeeping devices. According to Pliny, Sundials, or shadow clocks, were first introduced to Rome when a Greek sundial captured from the Samnites was set up publicly around 293-290 BC., [2] with another early known example being imported from Sicily in ...

7. Clock position - Wikipedia

   en.wikipedia.org/wiki/Clock_position

   The clock face with its clock positions is a heritage of Roman civilization, as is suggested by the survival of Roman numerals on old clocks and their cultural predecessors, sundials. The mechanical clock supplanted the sundial as the major timekeeper, while the Hindu–Arabic numeral system replaced the Roman as the number system in Europe in ...