Scientific Notation

A chronometer is a clock accurate enough to be used as a portable time standard on a vehicle, usually in order to determine longitude by means of celestial navigation. In Switzerland, only timepieces certified by the may use the word 'chronometer' on them.

Option (a), (b), (c) are unit of time, Shake is an informal unit of time equal to 10 nanosecond or . It has application in nuclear physics. A leap year is a year containing an extra day or month in order to keep the calender year in sync with an astronomical or seasonal year. While light year is the distance that light travels in one year. It is unit of distance and not of time.