Lunar eclipse occurs on

A lunar eclipse occurs on a full moon day, which corresponds to option [B]. During this celestial event, the Earth passes directly between the Sun and the Moon, with the three bodies aligning in a straight line. The Earth’s shadow then falls on the Moon, causing it to darken temporarily. The type of lunar eclipse—whether partial, total, or penumbral—depends on how deeply the Moon enters the Earth’s shadow. A total lunar eclipse occurs when the Moon passes completely through the Earth’s umbra (the central, darkest part of the shadow), while a partial lunar eclipse occurs when only a part of the Moon enters the umbra. A penumbral lunar eclipse occurs when the Moon passes through the Earth’s penumbral shadow, resulting in a subtle darkening of the lunar surface. Observing lunar eclipses provides valuable insights into Earth’s position in relation to the Sun and Moon and offers a breathtaking display of celestial mechanics visible from Earth.