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  2. Nocturnal (instrument) - Wikipedia

    en.wikipedia.org/wiki/Nocturnal_(instrument)

    A nocturnal is an instrument used to determine the local time based on the position of a star in the night sky relative to the pole star. As a result of the Earth's rotation, any fixed star makes a full revolution around the pole star in 23 hours and 56 minutes and therefore can be used as an hour hand. The 4-minute difference between the solar ...

  3. Aerobics - Wikipedia

    en.wikipedia.org/wiki/Aerobics

    Aerobics. Aerobics is a form of physical exercise that combines rhythmic aerobic exercise with stretching and strength training routines with the goal of improving all elements of fitness (flexibility, muscular strength, and cardio-vascular fitness). It is usually performed to music and may be practiced in a group setting led by an instructor ...

  4. Free-fall time - Wikipedia

    en.wikipedia.org/wiki/Free-fall_time

    The free-fall time is the characteristic time that would take a body to collapse under its own gravitational attraction, if no other forces existed to oppose the collapse.. As such, it plays a fundamental role in setting the timescale for a wide variety of astrophysical processes—from star formation to helioseismology to supernovae—in which gravity plays a dominant ro

  5. Telephone game - Wikipedia

    en.wikipedia.org/wiki/Telephone_game

    Telephone (American English and Canadian English), [1] or Chinese whispers (some Commonwealth English), is an internationally popular children's game in which messages are whispered from person to person and then the original and final messages are compared. [2] This sequential modification of information is called transmission chaining in the ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...

  8. PBS Kids - Wikipedia

    en.wikipedia.org/wiki/PBS_Kids

    The video player later expanded to include all PBS Kids programming, and the entire platform evolved into the PBS Kids Video app, which initially became publicly available for free on May 12, 2011. [28] The PBS Kids Video app is currently the primary source for free streaming of on-demand video clips and full episodes of PBS Kids programming ...

  9. Time - Wikipedia

    en.wikipedia.org/wiki/Time

    Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, and into the future. [1] [2] [3] It is a component quantity of various measurements used to sequence events, to compare the duration of events or the intervals between them, and to quantify rates of change of quantities in material reality or in the ...

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