Why does a lunar eclipse not happen every full moon?

A lunar eclipse doesn't happen every full moon because the moon's orbit around the Earth is tilted about 5 degrees relative to the Earth's orbit around the sun. This means that most of the time, the full moon is either above or below the Earth's shadow, and an eclipse doesn't occur. Only when the Earth, sun, and moon are aligned, with the Earth in the middle, does a lunar eclipse occur. This alignment happens approximately twice a year.

Why don't eclipses happen at every new and full moon?

Eclipses don't happen at every new and full moon because the moon's orbit is tilted about 5 degrees relative to the Earth's orbit around the sun. This means that the moon, Earth, and sun don't always align perfectly during the new and full moon phases. Eclipses only occur when the moon's orbit crosses the Earth's orbital plane at the same time that the moon is in the new or full phase.

Why don't we see a lunar eclipse once each month?

We don't see a lunar eclipse each month because the Moon's orbit around the Earth is tilted about 5 degrees relative to the Earth's orbit around the Sun. This means that the Earth, Sun, and Moon don't always align perfectly during a full moon to create an eclipse. Instead, lunar eclipses only occur when a full moon coincides with the Moon passing through the Earth's shadow, which happens about 2-4 times per year.

Why do lunar eclipses only form during a full moon?

A lunar eclipse occurs when the Earth comes between the Sun and the Moon, blocking the Sun's light from reaching the Moon. This can only happen during a full moon because that's the only time the Moon is directly opposite the Sun in Earth's sky. At all other times, the Moon, Earth, and Sun are not perfectly aligned, so the Earth's shadow cannot fall on the Moon, preventing a lunar eclipse.

Why don't we see a full moon once each month?

We actually do see a full moon once each month. The lunar cycle, which is the time it takes for the Moon to go through all of its phases, is approximately 29.5 days. This is roughly the length of a month. So, we see a full moon about once a month. However, the exact timing can vary slightly due to the Moon's elliptical orbit and the tilt of the Earth's axis.