You see the shadow of Earth cast upon the moon. The Sun's light creates the shadow and illuminates the quarter moon you see.
First Quarter occurs when the moon is at right angles with respect to the Earth and sun. During this phase, the moon has completed one quarter of it's orbit around the Earth and an observer on Earth will see half of the moon illuminated.
Just after the 'New Moon', the 'Crescent Moon' fills out into the 'First Quarter Moon'. Please see the related link below:
The last quarter of the Moon occurs when half of the side we see from Earth is illuminated. This phase happens after the waning gibbous phase and before the new moon phase in the lunar cycle.
The moon's surface is always half illuminated. We on Earth see 0 to 100% illumination of the side that faces use, depending on what phase the moon is at. Quarter phases, first and last, are half illuminated when seen from Earth.
See related link for a Moon phase calculator.
After a week from new moon, you'll see a half moon. This is more correctly called the First Quarter phase of the Moon.
We see a Half Moon illuminated. The name of this phase is called Last Quarter. First Quarter is 1 week before a Full Moon.
We see a Half Moon illuminated. The name of this phase is called Last Quarter. First Quarter is 1 week before a Full Moon.
First Quarter occurs when the moon is at right angles with respect to the Earth and sun. During this phase, the moon has completed one quarter of it's orbit around the Earth and an observer on Earth will see half of the moon illuminated.
full moon
The First Quarter Moon is the phase of the Moon which is most easily spotted by the casual observer. You see the Moon in this phase in the south as the Sun sets. If the sky is clear at sunset, you can't miss the first quarter Moon. In this phase, the Moon sets at midnight. In a crystal clear sky, you can even see the first quarter Moon a few hours before sunset in the southeast.the cicle is new moon, waxing crescent,first quarter, waxing gibbous, full moon, waning gibbous, last quarter, waning cresent,then new moon again and so on so a first quarter moon is when you can't seehalf the moon.
The amount of the lighted side of the moon you can see is the same during the first quarter and the last quarter phases. In both phases, half of the moon's illuminated side is visible from Earth.
This is the first quarter phase. The moon looks half lit, half in shadow, but you actually can only see one quarter of the moons surface at this point (during a full moon, you would only be able to see half of the moons surface - the half that faces us).
Just after the 'New Moon', the 'Crescent Moon' fills out into the 'First Quarter Moon'. Please see the related link below:
because only half of the visible moon is lite. we only see half the moon so only a quarter of the moon is lite.===================================Another take:After the New Moon . . .-- The 'first quarter' is the phase that's seen after 1/4 of the timeuntil the next New Moon has passed.-- The 'third quarter' is the phase that's seen after 3/4 of the timeuntil the next New Moon has passed.
At "half Moon" we see half of the Moon's hemisphere that is facing Earth. But "half Moon" isn't what astronomers call that phase of the Moon. It is called a "quarter Moon" phase. That's because the Moon has completed one quarter (at First Quarter phase) or three quarters (at Third Quarter phase) of an orbit around the Earth since new Moon. (Another possible reason is that we see a quarter of the total surface of the Moon at these phases.)
The waxing phase of the moon when you can see half of the lighted side is called the First Quarter Moon. During this phase, the moon is positioned at a right angle to the Earth and sun, resulting in half of its surface being illuminated. This occurs approximately one week after the New Moon phase, marking the transition from darkness to increasing light.