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2. Time clock - Wikipedia

   en.wikipedia.org/wiki/Time_clock

   Time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card, into a slot on the time clock.

3. Proper time - Wikipedia

   en.wikipedia.org/wiki/Proper_time

   Proper time. In relativity, proper time (from Latin, meaning own time) along a timelike world line is defined as the time as measured by a clock following that line. The proper time interval between two events on a world line is the change in proper time, which is independent of coordinates, and is a Lorentz scalar. [1]

4. Equation of time - Wikipedia

   en.wikipedia.org/wiki/Equation_of_time

   Mean solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would have a mean of zero. [1] The equation of time is the east or west component of the analemma , a curve representing the angular offset of the Sun from its mean position on the celestial ...

5. Sleep Calculator: How Much Sleep Do You Need? - Healthline

   www.healthline.com/health/sleep/sleep-calculator

   Sleep guidelines by age. Birth to 3 months: 14 to 17 hours. 4 to 11 months: 12 to 16 hours. 1 to 2 years: 11 to 14 hours. 3 to 5 years: 10 to 13 hours. 6 to 12 years: 9 to 12 hours. 13 to 18 years ...

6. Time dilation - Wikipedia

   en.wikipedia.org/wiki/Time_dilation

   Time dilation. Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them ( special relativity ), or a difference in gravitational potential between their locations ( general relativity ). When unspecified, "time dilation" usually refers to the effect due to velocity.

7. How to Get Over Jet Lag: 8 Tips and Suggestions - Healthline

   www.healthline.com/health/healthy-sleep/how-to...

   Continue to drink plenty of water upon your arrival. 4. Try light. Jet lag interrupts your internal clock in part because your exposure to light changes when you travel and change time zones ...