Time

Time is important human  life ,But not important animal, plant life ,nature internal time clock

Time is physics is defined by its measurement,

clock

sand clock,water clock, sun clock

Today digital clock

The English word is clock probably comes from the middle word klocke

The Latin word is clocca

France and German word mean bell

atomic clock

Atomic clock is based on Atomic Physics its measure on electromagnetic signal

atomic transition to measure on Lord Kelvin in 1879

use

• Global Position System
• Network time protocal
• signalling
• communication
• electrical engineering