>>938438541 (OP)
>>938440069
Google:
The SI unit for length, the meter (m), is defined by the fixed numerical value of the speed of light in a vacuum (c) being 299,792,458 when expressed in the unit m/s. This definition links the meter to the second, which is defined by the caesium frequency ΞΞ½Cs. Essentially, one meter is the distance light travels in a vacuum in exactly 1/299,792,458 of a second.
For useless american unit yard, you would first need to find a meter. One yard is equal to 0.9144 meters.