👉 In astronomy, an "ephemeron" is a celestial body's position in its orbit around the Sun. It is named after the Greek mathematician and astronomer Apollonius of Perga, who first described it in his work on astronomy in AD 208. The term comes from the Latin word "ephemera," which means "appearance" or "appearanceless." An ephemeral object (like a comet) is one that appears to have changed its position over
