Why is it not usual to express the earth-moon distance in astronomical units?
JOYCE Answer: An astronomical unit is equal to the average distance between the Sun and Earth (150 million km or 93 million miles). The distance to the Moon is on average 380,000 km. That’s equal to about 0.0025 astronomical units. The answer to your question is that it’s just easier to work with in kilometres rather than astronomical units as the units are too big. It’s a bit like measuring your height in kilometres rather than metres.
