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I learned this in science class- it takes 29 1/2 days for the moon to go from new moon to the next new moon.
Phase of the Moon on 29 December 1998: waxing gibbous with 85% of the Moon's visible disk illuminated. Full Moon on 1 January 1999 at 6:51 p.m. Pacific Standard Time.
On average, 29 1/2 days.
A full cycle is about 29.5 days, so a quarter cycle will be 1/4 of this, on average (divide 29.5 by 4). This is just an average; since the Moon's orbit is not a perfect circle, it may vary a bit.
Half of the Moon you cannot see because it faces away from Earth. Half of the side you could see is in darkness at "half Moon". That makes 3/4 of the Moon invisible and 1/4 visible. Hence "a quarter Moon" is visible. Another viewpoint: No, that's not really the answer. This is the answer: Let's start with "New Moon". Later, at "Full Moon", the Moon is halfway through its cycle of phases. Halfway between these two phases we see a half Moon. That's called the "first quarter" phase, because the Moon is a quarter of the way through its phases. So, that's why we see the half Moon at a "quarter" phase. It does cause confusion.
new moon
full
The First Quarter moon
1/2 of 29.53 days = 14.77 days (rounded)
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.
I learned this in science class- it takes 29 1/2 days for the moon to go from new moon to the next new moon.
1/2 moon
Within 1 day of a Full Moon.
1 month.
Today, January 1, 2011, the Moon is in the "waning crescent" phase with about 6% of the visible face of the Moon illuminated. There will be a partial solar eclipse on January 4, which can only occur at the precisely "new" moon.
The moon has four main phases. Every phase of moon is recurring every 27 1/2 days.