As the Moon orbits around the Earth and the Earth orbits around the Sun, the angle between the Sun, Moon, and Earth changes.
As a result, the amount of sunlight reflected from the Moon and traveling to our eyes changes every day. Cycle length can vary slightly, but the average is 29,53059 days.
See How Old is the Moon?
The secondary phase represents a span of time. than a certain time.
Phases of the moon - know 5 facts about the phases of the moon
1. NEW MONTH
This phase was chosen because it begins a new lunar cycle. At this time, the Sun and Moon are in conjunction, meaning they are closest together in the sky, on the same side of the Earth (Sun→Moon→Earth).
From our perspective, the Moon looks very dark: We usually can't see it because we're facing the shadow side of the Moon, which doesn't receive direct sunlight. But if we travel to the other side of the Moon, the part facing the Sun, it will be fully illuminated.
Sometimes, if the new Moon is positioned directly between the Sun and Earth, from our point of view, the Moon will partially or completely cover the Sun's disk, causing a solar eclipse. This event is only visible from a small part of the earth and requires special eye protection to be seen safely.
2. Crescent Waxing
Waxing crescent image This phase occurs between the new Moon and the first quarter phase. At the beginning of this stage, we see the crescent-shaped Moon, which in the Northern Hemisphere, appears on the side. The illuminated area is slowly enlarged each day, increasing the number of right sides of the lunar surface until the first quarter, when the entire right side is illuminated.
Some lunar and lunisolar calendars, such as the Islamic (or Hijri) calendar, designate the beginning of the month as the time the Moon is first seen, which is usually about one day after the new Moon, during the crescent stage.
3. FIRST HALF
Of the first quarter moon This phase got its name because by now the Moon has traveled 1/4 of the way through its orbit. This is an astounding label, because now from our point of view, 1/2 of the moon's surface is lit. In fact, the phase of the first and last quarter is called Half Moon.
In fact, we see 1/2 of the bright side of the Moon because the entire illuminated surface is only partially facing us.
4. GIBBOUS WAXING
Moon gibbous waxing This phase occurs between the first quarter and full moon and depicts the Moon when it is more than half lit, but not yet fully. In the southern hemisphere, the same thing happens, only from left to right.
"Gibbous" comes from a Latin word meaning "bent," referring to the curved area on the Moon's surface.
5. FULL MOON
This phase was chosen because from our point of view the full meal has already begun.
Sometimes, if the position of the Moon is parallel to the Earth's Sun and the full moon, from our point of view, enters the Earth's shadow, it will be part or all of the sunlight reflected from the Moon's surface, thus causing the Moon to occur.