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  2. Clock angle problem - Wikipedia

    en.wikipedia.org/wiki/Clock_angle_problem

    A method to solve such problems is to consider the rate of change of the angle in degrees per minute. The hour hand of a normal 12-hour analogue clock turns 360° in 12 hours (720 minutes) or 0.5° per minute. The minute hand rotates through 360° in 60 minutes or 6° per minute. [1]

  3. Clock face - Wikipedia

    en.wikipedia.org/wiki/Clock_face

    '12:14' in both analog and digital representations. In the analog clock, the minute hand is on "14" minutes, and the hour hand is moving from "12" to "1" – this indicates a time of 12:14. A ship's radio room wall clock during the age of wireless telegraphy showing '10:09' and 36 seconds'. The green and red shaded areas denote 3 minute periods ...

  4. Wheel train - Wikipedia

    en.wikipedia.org/wiki/Wheel_train

    Motion work of a clock, showing (f) center wheel, (x,b) cannon pinion, (x') minute wheel, (y,c) hour wheel, (t) hour hand, (m) minute hand. The motion work is the small 12-to-1 reduction gear train that turns the timepiece's hour hand from the minute hand. [6] [7] It is attached to the going train by the friction coupling of the cannon pinion ...

  5. Clock - Wikipedia

    en.wikipedia.org/wiki/Clock

    The hours are indicated with an hour hand, which makes one or two revolutions in a day, while the minutes are indicated by a minute hand, which makes one revolution per hour. In mechanical clocks a gear train drives the hands; in electronic clocks the circuit produces pulses every second which drive a stepper motor and gear train, which move ...

  6. Time in physics - Wikipedia

    en.wikipedia.org/wiki/Time_in_physics

    One example might be a yellow ribbon tied to a tree, or the ringing of a church bell. A signal can be part of a conversation, which involves a protocol. Another signal might be the position of the hour hand on a town clock or a railway station. An interested party might wish to view that clock, to learn the time.

  7. Orders of magnitude (time) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(time)

    1.8 ks: The time slot for the typical situation comedy on television with advertisements included 2.28 ks: The duration of the Anglo-Zanzibar War, the shortest war in recorded history. 3.6 ks: The length of one hour (h), the time for the minute hand of a clock to cycle once around the face, approximately 1/24 of one mean solar day

  8. Rotational frequency - Wikipedia

    en.wikipedia.org/wiki/Rotational_frequency

    Rotational frequency can measure, for example, how fast a motor is running. Rotational speed is sometimes used to mean angular frequency rather than the quantity defined in this article. Angular frequency gives the change in angle per time unit, which is given with the unit radian per second in the SI system.

  9. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    Likewise for years prior to 2000 one must add multiples of 2 π. For example, for the year 2010, D varies from 3653 on 1 January at noon to 4017 on 31 December at noon; the corresponding M values are 69.078 9468 and 75.340 4748 and are reduced to the range 0 to 2 π by subtracting 10 and 11 times 2 π respectively. One can always write: 5) D ...

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