Commonly Defined Time Scales and Standards


Common Time

Astronomical Cycles


Cepheid Variables 

Atomic Time Frequencies

International Atomic Time

The Age of the Universe

Earth Time

Coordinated Universal Time

Electrical and Acoustic Transmissions

Standard Time

Geospheric Cycles

Geophysical Time

Measuring Geological Time

Biological Time

Time and Evolution

Radiometric Dating

Mutation Rate

Sensory and Motor Clocks

The Brain

Sensory Awareness

Memory and Consciousness

Psychological Time

Social and Cultural Time

Historical Time

Time and Number

Time and Distance

Degrees of Time

Time and Information

System Control Time

Critical Timing