Terra (mythology) vegetative and animal fertility and abundance. Tellumo is identified by St. Augustine as the male counterpart of Tellus. A Tellurus is named uniquely by Martianus Capella (1.49). In several modern Romance languages, "terra" (or French "terre") is the name of planet Earth. Following post-classical Latin astronomical terminology, Earth is sometimes referred to as "Terra". Terra (mythology) In ancient Roman religion and myth, Tellus Mater or Terra Mater ("Mother Earth") is a goddess of the earth. Although Tellus and Terra are hardly distinguishable during the Imperial era, "Tellus" was the name of the original earth goddess in the religious practices of
Solar mass measurement, the solar mass came into use before the AU and the gravitational constant were precisely measured. This is because the relative mass of another planet in the Solar System or the combined mass of two binary stars can be calculated in units of Solar mass directly from the orbital radius and orbital period of the planet or stars using Kepler's third law, provided that orbital radius is measured in astronomical units and orbital period is measured in years. The mass of the Sun has been decreasing since the time it formed. This occurs through two processes in nearly equal