A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Select the first letter of the word from the list above to jump to appropriate section of the glossary. If the term you are looking for starts with a digit or symbol, choose the '#' link. - I - inferior conjunction The position of an inferior planet, as seen from Earth, when it is between the Sun and the Earth. inferior planet A planet whose orbit lies inside the Earth's orbit (between Earth and the Sun. These planets are Mercury and Venus. Back to Top