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# Circumference

A circle diagram showing the circumference, the radius and the diameter

The circumference of any circle or ellipse is the distance that a point on that circle or ellipse travels in a full circuit of it.

## Mathematics

The formula for calculation of the circumference of any circle is:

c = π × d = 2 × π × r[1]

where:

d is the diameter,
r the radius and
π = 3.14159...

## Astronomy

In astronomy the circumference of an orbit is the total distance through which an orbiting body displaces itself before arriving at the same orientation with respect to the primary and the fixed stars.

## References

1. Chernoutsan Alexei I; Egorov, A. V.; Manzhirov, A. D.; Polyanin, V. D.; Popov, V. A.; Putyatin, B. V.; Repina, Yu.V.; Safrai, V.M.; Zhurov, A. I (2011). Polyanin, Andrei D.; Chernoutsan Alexei I. ed. A Concise Handbook of Mathematics, Physics and Engineering Sciences. Boca Raton, FL: CRC Press. p. 69. ISBN 978-1-4398-0640-1.