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History
Clock position
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A clock position, or clock bearing, is the direction of an object observed from a vehicle, typically a vessel or an aircraft, relative to the orientation of the vehicle to the observer. The vehicle must be considered to have a front, a back, a left side and a right side. These quarters may have specialized names, such as bow and stern for a vessel, or nose and tail for an aircraft. The observer then measures or observes the angle made by the intersection of the line of sight to the longitudinal axis, the dimension of length, of the vessel, using the clock analogy.
Horizontal sundial of 1812 matching the clock positions in Roman numerals on the outside dial to the points of a compass rose on the inside dial. The
Horizontal sundial of 1812 matching the clock positions in Roman numerals on the outside dial to the points of a compass rose on the inside dial. The XII position is true north.
Traffic information would be issued to the pilot of aircraft “A” as 12 o'clock. The actual position of the traffic as seen by the pilot of aircraft “A
Traffic information would be issued to the pilot of aircraft “A” as 12 o'clock. The actual position of the traffic as seen by the pilot of aircraft “A” would be 2 o'clock. Traffic information issued to aircraft “B” would also be given as 12 o'clock, but in this case, the pilot of “B” would see the traffic at 10 o'clock.
Roman basin sundial, a Mesopotamian type. The pointer casts a shadow over the engraved hour lines in the basin. The hours are numbered I-XII, running
Roman basin sundial, a Mesopotamian type. The pointer casts a shadow over the engraved hour lines in the basin. The hours are numbered I-XII, running from the first hour of the day on the left to the last on the right. The pointer is set at meridies, “mid-day,” which is at 6:00. The hours are “seasonal;” that is, the number of degrees in an hour depends on the day of the year. 6:00 is intended to be a true bearing; that is, at 12:00 solar time the shadow over the VI line must point due north or south.
Clock face
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A clock face is the part of an analog clock that displays time through the use of a flat dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands. In its most basic, globally recognized form, the periphery of the dial is numbered 1 through 12 indicating the hours in a 12-hour cycle, and a short hour hand makes two revolutions in a day. A long minute hand makes one revolution every hour. The face may also include a second hand, which makes one revolution per minute. The term is less commonly used for the time display on digital clocks and watches.
A wall clock showing the time at 10:09
A wall clock showing the time at 10:09
15th-century rotating dial clock face, St. Mary's Church, Gdańsk, Poland
15th-century rotating dial clock face, St. Mary's Church, Gdańsk, Poland
French decimal clock (with the 24 standard hours included around the outside)
French decimal clock (with the 24 standard hours included around the outside)
A modern quartz clock with a 24-hour face
A modern quartz clock with a 24-hour face