The four planets of the solar system that are closest to the sun (Mercury, Venus, Earth, and Mars); also called the terrestrial planets.
The faster moving planets that are in the inner part of the solar system. Includes the Sun, Mercury, Venus, and Mars; usually the Moon is included. These planets generally indicate parts of the personality that are well-known to the ego and relate to everyday behavior patterns. Also known as personal planets.
the four solid, rocky planets closest to the Sun, Mercury, Venus, Earth, and Mars