From a particular location on Earth, why can we see many more total eclipses of the Moon than total eclipses of the Sun?

the Moon is much bigger in the sky than the Sun

a total lunar eclipse is visible over a much larger part of the Earth’s surface than a total solar eclipse

the Moon is always in the same place in our sky, while the Sun moves around the sky

the line-up of the Earth, Moon, and Sun needed for a lunar eclipse happens many, many times more often than the line-up needed for a solar eclipse

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.