any of the planets whose orbit lies inside the earth's orbit

a planet whose orbit is inside the Earth's orbit around the Sun: Mercury and Venus

A planet with an orbit lying closer to the Sun than the Earth's. The inferior planets are Mercury and Venus. Inferior planets are always close to the Sun and so are difficult to observe. They can be seen as evening and morning stars. Venus is the brighter of the two but Mercury is also a clearly visible unaided eye object. See also superior planets.

An Inferior Planet is a planet whose orbit lays inside the orbit of the Earth. These are: Mercury & Venus.

Mercury or Venus, so-called because their orbits are inside Earth's orbit around the Sun and therefore inferior to Earth in terms of distance from the Sun.

a planet that orbits the sun inside of Earth’s orbit; includes Mercury and Venus

A planet that orbits between the Earth and the Sun. Mercury and Venus are the only two inferior planets in our solar system.

An inferior planet is one which is closer to the Sun than another planet and hence will never stray further than a certain distance from the Sun in the sky as seen from the more distant planet. As viewed from Earth, Mercury and Venus are inferior planets.

a planet whose orbit lies inside Earth's orbit (Mercury or Venus).