Give reason
The penumbra is faint.
MSCERT Class 7 General Science Ch 3 Propagation of Light
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That part of the shadow is known as the penumbra, so the Moon’s passage through it is a penumbral lunar eclipse.
Lunar eclipses occur only at full Moon because that’s when the Moon lines up opposite the Sun, which is where Earth’s shadow is. Most full Moons don’t produce eclipses, though. The Moon’s orbit around Earth is tilted slightly with respect to Earth’s orbit around the Sun. So most months, the Moon passes a little above or below the shadow, leaving the Moon uneclipsed.
Lunar eclipses occur only at full Moon because that’s when the Moon lines up opposite the Sun, which is where Earth’s shadow is. Most full Moons don’t produce eclipses, though. The Moon’s orbit around Earth is tilted slightly with respect to Earth’s orbit around the Sun. So most months, the Moon passes a little above or below the shadow, leaving the Moon uneclipsed.
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