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Encyclopedia > Light minute

A light minute (also written light-minute) is a unit of length. It is defined as the distance light travels in an absolute vacuum in one minute or 17,987,547,480 metres (~18 Gm). Note that this value is exact, since the metre is actually defined in terms of the light second.


To give an example, the average distance from the Earth to the Sun (or 1 astronomical unit) is 8.317 light minutes.


See also: speed of light


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Using light therapy at home to treat seasonal affective disorder (SAD) (1121 words)
Light therapy is treatment with a special type of light that is much brighter than a lamp or other light fixture in your home.
Studies vary as to whether light therapy at other times of the day is less effective, but some people with SAD (perhaps those who wake up normally in the early morning) should do their light therapy for 1 to 2 hours in the evening, ending 1 hour before bedtime.
The safest light is fluorescent, not full-spectrum or ultraviolet light.
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