However, at one time the value of a "yard" was arbitrarily defined as the distance from the tip of the king's nose to the end of his outstretched hand, which created a significant problem: When a new ...However, at one time the value of a "yard" was arbitrarily defined as the distance from the tip of the king's nose to the end of his outstretched hand, which created a significant problem: When a new king was crowned, the definition of the yard changed. The International System of Units is a system of measurement based on the metric system and has been adopted by scientists as their official system of measurement.