> Could one derive the Earth's rotation? The motion of the solar system? It's not a motion sensor; it's an acceleration sensor. That's an important distinction

> Could one derive the Earth's rotation? The motion of the solar system? It's not a motion sensor; it's an acceleration sensor. That's an important distinction because the primary problem with IMUs is that they work of changes in velocity, and error in those measurements slowly accumulate - so they almost always need external references to correct for accumulated drift.