The moon and earth are always exactly in line; any two points define a line. When the earth moon and sun are all exactly in line, that is different. When this happens it is either a solar eclipse or it is a lunar eclipse.
When the Sun, Earth and Moon line up exactly, an eclipse occurs. If the alignment is sun, Moon, Earth, then it is a solar eclipse. If the alignment is Sun, Earth, Moon, then we have a lunar eclipse.
When the Sun, Moon and Earth are all lined up exactly, we have an eclipse. If the Earth is in the middle, it's a lunar eclipse. When the Moon is in the middle, it's a solar eclipse.
When the Sun, Moon and Earth are all lined up exactly, we have an eclipse. If the Earth is in the middle, it's a lunar eclipse. When the Moon is in the middle, it's a solar eclipse.
That's Full Moon. If the arrangement is in exactly the same line, then there's a lunar eclipse.
During a solar eclipse, when the moon passes between the sun and the Earth, the sun can be partially concealed by the moon. This alignment creates a temporary blocking of sunlight, casting a shadow on Earth.
Because the sun, Earth and moon rarely ever line up EXACTLY in a straight line.
That's Full Moon. If the arrangement is in exactly the same line, then there's a lunar eclipse.
In a solar eclipse, the Sun, the Moon and the Earth line up almost exactly so that the shadow of the Moon falls on the Earth.
An eclipse happens when the Sun, the Moon and the Earth line up almost exactly. When the shadow of the Moon falls on the Earth, this is a solar eclipse. When the shadow of the Earth falls on the Moon, this is a lunar eclipse. On average, there are two solar eclipses and two lunar eclipses each year. About half of these are partial eclipses, in which the Sun, Moon and Earth don't QUITE line up exactly.
That happens at New Moon and it is the time for a solar eclipse when those three objects line up exactly.
When they are exactly in line there is an eclipse. When they are nearly in line it is either Full Moon or New Moon. The word parallel is inappropriate here, as only lines can be parallel, not objects.
In a gravitational situation, the forces are exactly equal in both directions.-- The Earth attracts the moon with a force that is exactly the same as the forcewith which the moon attracts the Earth.-- You attract the Earth with exactly the same amount of force as the Earth attracts you.-- Your weight on Earth is exactly the same as the Earth's weight on you.