### Speed of Light--Almost One Foot Per Nanosecond

The speed of light (`c`) approximates one foot per nanosecond.

```   google:  speed of light ...or... c
the speed of light = 299 792 458 m / s

http://en.wikipedia.org/wiki/Speed_of_light

google:  speed of light to ft per second ...or ... c to ft per sec
the speed of light = 983 571 056 feet per second

http://galileoandeinstein.physics.virginia.edu/lectures/spedlite.html

983 571 056 x (10^(-9)) = 0.983571056

first hyperlink:  none; mathematical expression used
```

The nano- prefix implies one-billionth of something; therefore, one nanosecond is one-billionth of a second.

```   983,571,056 ft     1 second        983,571,056 ft
-------------- x ------------- =  ---------------- = 0.983571056 ft
1 second      1,000,000,000     1,000,000,000

The 'second' unit in the denominator of the left-hand fraction and
the 'second' unit in the numerator of the right-hand fraction cancel
each other leaving the answer in terms of feet (or faction of a foot).
```

`0.983571056 foot` is approximately `1.643%` shorter than `one foot`. With respect to inches, light travels at a speed of about `11.802852672 inches per nanosecond`.

```   google: speed of light to in per second
the speed of light = 1.18028527 x 10^10 in per second

google: 1.18028527 x 10^10 x 10^-9
1.18028527 x (10^10) x (10^(-9)) = 11.8028527

first hyperlink:  none; mathematical expression used
```

In a nanosecond, light travels about `two-tenths of an inch` short of a foot.

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 25 April 2007