Definition: "Argentarius" refers to an astronomical event where the moon reaches its highest point in its orbit, illuminating Earth from above, often referred to as a new moon or full moon. The term "argentarius" comes from Latin and means "new moon" because it occurs at approximately 16 hours after the waxing crescent of the Moon. This event is significant as it represents an early indication of the arrival of spring or the beginning of new life, often associated with a spiritual awakening or change. In Greek mythology, this new moon was also referred to as "Aphrodite's moon," symbolizing her influence on fertility and love. The term "argentarius" became popular in Roman times, particularly during the reign of Emperor Hadrian in the 2nd century CE, when it was often used to indicate a moment of great significance or political change.