Related Words

Apogee: The point farthest from the earth on the moon's orbit. This term can be applied to any other body orbiting the earth, such as satellites. It is the opposite of perigee.

Awdl: (from Middle Welsh odl) The term in Welsh poetry has come to acquire several meanings. In its earliest usage, an awdl meant a stave bearing the rhyme in any poem. Next, it came to mean a ser . . . View Full Definition

Parallax Inequality: The variation in the range of tide or in the speed of a tidal current due to changes in the distance of the Moon from the Earth. The range of tide and speed of the current tend alternately t . . . View Full Definition

Apsides: The points in the orbit of a planet or moon which are the nearest and farthest from the center of attraction. In the Earth's orbit these are called perihelion and aphelion, and in the Moon's . . . View Full Definition

Apogean Tides Or Tidal Currents: Tides of decreased range or currents of decreased speed occurring monthly as the result of the Moon being in apogee. The apogean range (An) of the tide is the average range occurring at the . . . View Full Definition

Perigee: The point nearest the earth on the moon's orbit. This term can be applied to any other body orbiting the earth, such as satellites. It is the opposite of apogee.