| A | B |
|---|
| latitude | the angular distance north or south on the Earth's surface measured from the equator |
| local noon | when the Sun reaches its highest point during the day for a given place on Earth |
| longitude | the angular distance east or west on the Earth's surface as measured from the Prime Meridian in Greenwich, England |
| lunar | of or relating to the Moon |
| lunar eclipse | the passage of the Moon behind the Earth, occurring at full Moon, so that the Earth is positioned between the Sun and Moon |
| midnight | the time at which the Sun is on the meridian on the opposite side of the Earth. Midnight does not necessarily correspond to the clock |
| natural satellite | a naturally occurring body that orbits a larger celestial body. A natural satellite that orbits a planet is called a "moon," after our Moon |
| neap tides | the diminished tidal effect that occurs when the Moon is at first and last quarter and pulling at right angles to the Sun, so that the tidal effects are working against each other |
| noon | the time at which the Sun is on the meridian for a given location on Earth. Noon does not necessarily correspond with the clock |
| orbit | the path followed by an object in its revolution around another body |
| partial eclipse | an eclipse (lunar or solar) in which the disk of the Moon or Sun is not completely covered by the eclipsing body |
| phase | any of the various stages of illumination of the Moon or a planet by the Sun |
