At the time of the "First Quarter" and "Third Quarter" phases, the moon appears
half-illuminated. These occasions are roughly 7 days and 21 days after New Moon
respectively, and Full Moon occurs at the time exactly midway between them.
Note:
Both phases are easily visible in the daytime. First Quarter rises in the east
around Noon, and Third Quarter sets in the west around Noon.
The moon in the days before and after a full moon appear as a gibbous moon. A gibbous moon is anything between a full moon and a half moon.
There are two phases of the moon that appear to be a half disk: the first quarter and the third quarter. The entire cycle of moon phases takes about 28 days (27.3217 days). Counting the day of a new moon as the first day, then the phases in order are: • waxing crescent • first quarter (a half lit moon resembling the letter "D") at end of week one • waxing gibbous • full at end of week two • waning gibbous • third quarter (a half lit moon resembling the letter "C") at end of week three • waning crescent • and back to the new moon, completing the cycle after week four
Half-moon Half-Earth
The first phase after new moon which is Waxing Crescent.
We see more of the moon lit when it is a gibbous moon than when it is a crescent moon, so it does seem bigger. Save
Assuming you're asking how often a "half moon" appears, a half moon (First or Third Quarter moon) will usually occur every 14-15 days (half a lunar month).
First quarter and last quarter appear as a half moon. about halfway down this page are some pictures: http://www.calculatorcat.com/moon_phases/moon_phases.phtml
The moon in the days before and after a full moon appear as a gibbous moon. A gibbous moon is anything between a full moon and a half moon.
Half of it, the same as always. Half of the visible side of the Moon will be brightly lit by the Sun, and the other half is often dimly visible by reflected earthshine, sunlight that is reflected from the Earth and then shines down on the night side of the Moon.
From a great height, Japan would be appear to be in the shape of a "half moon."
A half moon appears when only half of the moon's illuminated side is visible from Earth. This occurs when the moon is at a 90-degree angle relative to the Earth and the sun, known as the first quarter or third quarter moon.
Somewhere between half and all of the visible part of the Moon will be bright in that case, depending on the exact position of the Moon.
Hi, I witnessed a red moon yesterday morning, June 16, 2009 around 1 am. It was a half-moon and low in the sky.
You can often see the entire "near side" of the Moon, because even though the sunlit half is very bright, the other part is dimly lit by reflected Earthlight. However, the official answer to your question is probably "one quarter". You can only see one-half of the Moon, and only half of that is lit up by the Sun.
Two weeks after a full moon, the moon would appear as a waning gibbous, with more than half but less than fully illuminated. It would be visibly less bright than during a full moon, with a larger portion of the left side darkened.
quarter Moon if its half of a sphere then its half moon
If you are on the moon at the time of "New Moon", and you are facing the earth, you see a "Full Earth". If you stay up there a while, and call your partner on earth every day, and you describe to each other what you're seeing, you'll notice something very interesting: The part of the moon that HE sees, plus the part of the earth that YOU see, always adds up to a complete circle of illumination. Each of you sees the part of the circle that the other one is missing.