A millisecond (from milli- and second; symbol: ms) is a unit of time in the International System of Units (SI) equal to one thousandth (0.001 or 10−3 or 1/1000) of a second and to 1000 microseconds. A unit of 10 milliseconds may be called a centisecond, and one of 100 milliseconds a decisecond, but these names are rarely used. To help compare orders of magnitude of different times, this page lists times between 10−3 seconds and 100 seconds (1 millisecond and one second). See also times of other orders of magnitude. Examples The Apollo Guidance Computer used metric units internally, with centiseconds used for time calculation and measurement. 1 millisecond (1 ms) – cycle time for frequency 1 kHz; duration of light for typical photo flash strobe; time taken for sound wave to travel about 34 cm; repetition interval of GPS C/A PN code 1 millisecond - time taken for light to travel 204.19 km in a single mode fiber optic cable for a wavelength of 1550nm (frequency : 193 THz). 1.000692286 milliseconds – time taken for light to travel 300 km in a vacuum 1 to 5 milliseconds – typical response time in LCD computer monitors, especially high-end displays 2 milliseconds – Shift time for a modern Formula One car using a seamless-shift semi-automatic sequential transmission 2.27 milliseconds – cycle time for pitch A440, the most commonly used pitch for tuning musical instruments 3 milliseconds – a housefly's wing flap. Also the normative speed of sound (an issue in track and field) 3.3 milliseconds – normal delay time between initiation and detonation of a C4 explosive charge 4 milliseconds – typical average seek time for a 10,000 rpm hard disk 5 milliseconds – a honey bee's wing flap 5 milliseconds to 80 milliseconds – a hummingbird's wing flap 8 milliseconds – 1/125 of a second, a standard camera shutter speed (125); fastest shifting time of a car's mechanical transmission 10 milliseconds (10 ms) – a jiffy, cycle time for frequency 100 Hz 10.378 milliseconds – rotation period of pulsar B1639+36A 15.625 milliseconds – a two hundred fifty-sixth note at 60 BPM 16.67 milliseconds (1/60 second) – a third, cycle time for American 60 Hz AC electricity (mains grid) 16.68 milliseconds (1/59.94 second) – the amount of time one field lasts in 29.97 fps interlaced video (commonly erroneously referred to as 30 fps) 20 milliseconds – cycle time for European