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The Moon is currently moving away from Earth by about 1.6 inches (4 centimeters) inches every year (destined, alas to disintegrate). We happen to stand on this planet at a time when the Moon's apparent size in the sky is exactly the same as that of the Sun. The Moon's actual diameter is much smaller than the Sun, but it is much closer to us. Eventually, however, a total lunar eclipse won't be geometrically possible, just as it as not possible in the distant past when the Moon was nearer to us.
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