As seen from the earth, never.
A horizontal half moon is called a crescent moon.
The gibbous phases of the Moon occur when the visible face of the Moon is more than half illuminated, but not fully illuminated.
Waxing moving towards a full moon.
Every 28 and a half days a year
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.
A horizontal half moon is called a crescent moon.
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).
This happens when the moon is on the opposite side of the earth from the sun. The moon reflects the light of the sun, and because it is directly opposite, we can see half of it from the earth. This is the half that appears as the full moon.
The gibbous phases of the Moon occur when the visible face of the Moon is more than half illuminated, but not fully illuminated.
Waxing moving towards a full moon.
The full moon cycles through each of the zodiac signs 12 times a year. Occasionally, it will occur in the same sign twice in one month.
Every 28 and a half days a year
The "gibbous" moon phases occur when the Moon is more than half illuminated, but less than full.
A lunar eclipse can only occur during a full moon because the lunar eclipse causes the Moon to pass directly behind the Earth and into its shadow. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely with the Earth in the middle.
No they dont occur everyday they occur only on full,new and half moon day. - Abhi jain (advanced academy)
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.
They are the same thing. "Half Moon" refers to half of the Moon's hemisphere that faces Earth being illuminated. That happens at one quarter and three quarters of the way through the Moon's phases. That's why we refer to the "first quarter" and the "third quarter" in the Moon's phases.