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a This is an exact value. The second (s) is now defined in terms of atomic vibrations, and the metre (m) as the distance travelled by light in a vacuum in 1/(2.99792458 x 108) s. b The kilogram (kg) is still defined as the mass of a metal cylinder at the International Bureau of Weights and

Measures, Sèvres, France. c This is the distance travelled by light in a vacuum in 1 year of 365.2425 days. d The mean solar day is presently (2006) 86 400.0004 s.

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