Hesperus, also known as the Evening Star, is the name given to the planet Venus when it appears in the western sky after sunset. It is one of the brightest objects in the night sky, often mistaken for a star due to its brilliance. Hesperus has been observed since ancient times and is associated with various mythologies and cultures. In astronomy, Hesperus is significant because it helps astronomers understand the orbit and phases of Venus. The planet goes through a cycle of visibility, appearing as Hesperus in the evening and as Phosphorus or the Morning Star before sunrise. This duality has fascinated humans for centuries.