A "gibbous" Moon has between 51% and 99% of the illuminated side of the Moon visible from Earth.
Just to be precise; the Moon is always 50% illuminated. The Moon is a rocky ball, half in sunlight and half in darkness. As the Moon orbits the Earth, the same face of the Moon is always visible. From the Earth, we see "phases" of the Moon as the Moon orbits the Earth. At the new moon phase, the illuminated half of the Moon is the "far side" of the Moon; at the full, the illuminated half is the "near side".
* Dark Moon - Not visible * New Moon - Not visible, or traditionally, the first visible crescent of the Moon * Waxing Crescent Moon - Right 1-49% visible * First Quarter Moon - Right 50% visible * Waxing gibbous Moon - Right 51-99% visible * Full Moon - Fully visible * Waning gibbous Moon - Left 51-99% visible * Third Quarter Moon - Left 50% visible * Waning Crescent Moon - Left 1-49% visible * New Moon - Not visible ref from http://www.answers.com/main/ntquery?s=moon+phases&gwp=13 Rob
last quarter,crescent,new and first quarter.
Square Wave
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a lunar eclipseThat's called a lunar eclipse.It goes through most of the same phases as a solar eclipse, but it's easier to watch by eye. Even better with binoculars, telescope, or a camera with zoom.
A gibbous moon is one of the phases of the Moon, when the size of the illuminated portion is greater than half but not a full Moon.
The moon is called a first quarter moon at the halfway point in its journey around Earth. This is when the right half of the moon is illuminated. A gibbous moon occurs when more than half, but not all, of the moon is illuminated.
The moon would be called a waxing gibbous when it is just larger than a half.
A moon between half and full is called 'gibbous'.
The moon is called waxing gibbous when it is approaching its full phase. This means that more than half of the moon is illuminated, but it is not yet full.
It's called a waning gibbous moon.
Gibbous moon taken on january 14th 2001 at approx.The first week after full, it is called waning gibbous.
The Sun illuminates the almost spherical Moon. If the angle between an observer on Earth, the Moon and the Sun is less than 90 - but more than 0 degrees and the Moon this month has not been full, it is called waxing (growing) gibbous (observers see more than half illuminated).
The moon phase between waxing crescent and first quarter is called waxing gibbous. In this phase, the moon is more than half illuminated but less than full.
When less and less of the illuminated half of the moon can be seen each night, it is called the "waning" phase of the moon. Specifically, this occurs after the full moon, leading to phases such as the waning gibbous and waning crescent. During this time, the visible portion of the moon decreases until it reaches the new moon phase.
the moon has many different phases like waxing gibbous. A waxing gibbous appears high in the east at sunset. Its more than half-lighted, but less than full.Waning moon- anytime after full moon and before new moon (so called because its illuminated area is decreasing). Also called old moon. Cf. waxing moon.
It is called a waxing gibbous