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What is the Day ?

Source: en.wikipedia.org

" The word day has a number of meanings, depending on the context it is used such as of astronomy, physics, and various calendar systems. (...)
The unit of measurement "day" (symbol d) is defined as 86,400 SI seconds. The second is designated the SI base unit of time. (...) "

Length Units

Millimeter Centimeter Meter Kilometer Mile Yard Foot Inch

Temperature Units

Celsius Kelvin Fahrenheit

Area Units

Acre Square meter Square kilometer Hectare Square mile Square yard Square foot Square inch

Volume Units

Cubic meter Cubic foot Cubic inch Liter Milliliter Imperial gallon US liquid gallon

Weight Units

Milligram Gram Kilogram Metric Ton Pound Ounce Carat

Time Units

Second Millisecond Minute Hour Day Week Month Year

Speed Units

meter / second kilometer / hour mile / hour

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