The full moon occurs whenever the moon orbits the earth opposite the sun. It takes the moon roughly 28 days to orbit the earth, so once every two weeks it is opposite the sun from us (full moon), and two weeks later it is on the same side as the sun and all we see is the moon's "night" side (new moon).
They occur about once a year. Called perigee-syzygy or perigee moons by the astronomical community, they occur when a full or new moon (syzygy) is closest in its orbit to the earth (perigee), when the sun, earth and moon are aligned.
The next full moon will typically occur after about 14-15 days from a new moon. This is because the lunar cycle lasts approximately 29.5 days, meaning it takes that long for the moon to go from new moon to full moon and back to new moon again.
Total eclipses do not occur during every full moon and new moon because the orbits of the Earth and the Moon are tilted relative to each other by about 5 degrees. This tilt means that the Moon often passes above or below the Earth's shadow during a full moon (lunar eclipse) and the Earth’s shadow often misses the Moon during a new moon (solar eclipse). Total eclipses only happen when the Sun, Earth, and Moon align perfectly, which occurs only a few times a year.
At the time of answering this question (May 6th, 2013), the next new moon will be on May 10th, 2013.
In August, 2011, New Moon is the night of August 28th. Note that "New Moon" visually doesn't appear - there is no moon to seeon the night of "new moon".
For a new moon to occur the moon must be between earth and the sun
New moons occur every 4 weeks.
The New Moon always occurs very close to the moon's "new moon" phase.
The lunar cycle lasts 28 days.
New moon (the Earth goes into the shadow of the Moon) Lunar eclipses occur at full moon (the Moon goes into the Earth's shadow)
A solar eclipse only can occur at the time of the New Moon,but doesn't occur at the large majority of them.
The New Moon occurs when the moon is between the earth and the sun.
In a new moon
New Moon
They occur about once a year. Called perigee-syzygy or perigee moons by the astronomical community, they occur when a full or new moon (syzygy) is closest in its orbit to the earth (perigee), when the sun, earth and moon are aligned.
At a full moon.
The next full moon will typically occur after about 14-15 days from a new moon. This is because the lunar cycle lasts approximately 29.5 days, meaning it takes that long for the moon to go from new moon to full moon and back to new moon again.