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Q:

# What is smaller than a nanosecond?

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A nanosecond is one-billionth of a second, but time can be measured by increments far shorter. A picosecond is three orders of magnitude shorter, one-trillionth of a second, and a femtosecond is shorter still at one-quadrillionth of a second.

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Dividing the second still further, and by three orders of magnitude each time, the divisions are attoseconds, zeptoseconds and yoctoseconds; the last of these is 0.000,000,000,000,000,000,000,001 second. According to Wikipedia, the shortest theoretical increment of time is the Planck time. This is the time taken for a photon, traveling at the speed of light, to cross a Planck distance. This upper limit is 10^-43 second.

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## Related Questions

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Mid-afternoon is not a precise measure of time but is rather a vague term to refer to the approximate middle of the time between 12 p.m. and sunset. Because the sun sets at different times throughout the year and at different latitudes across the planet, there is no one precise time that can be defined as mid-afternoon.

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The Aztec calendar is a visual representation of how the culture measured time. The Aztec calendar stone is a decorative representation of the calendar as well as a memorial to ritual deities.

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To subtract time, first subtract the hours and then the minutes. If the subtraction of minutes results in a negative answer, increase the number of minutes by 60 and take away 1 from the subtracted number of hours.