 According to the collection of Zhou Chinese poetic anthologies "Classic of Poetry", one of the distant ancestors of King Wen of the Zhou dynasty used to measure gnomon shadow lengths to determine the orientation around the 14th century BC.The ancient Greek philosopher Anaximander (610–546 BC) is credited with introducing this Babylonian instrument to the Ancient Greeks.The ancient Greek mathematician and astronomer Oenopides used the phrase "drawn gnomon-wise" to describe a line drawn perpendicular to another.