>Does a meteorite have to hit the Earth at a 90 degree angle to get a circular impact crater?
The movies get it wrong. It’s not a big rotating ball with diesel flames billowing behind it, and you wouldn’t see it move. It’s more of a lightning bolt, an absolutely straight line that happens all at once and doesn’t have any direction to it. The meteorite burrows under ground and slows to a stop. However, there is a great deal of heat involved, and the matter closest at hand is vaporized, and the vapor blows a crater open. The same thing happens on smaller scales with shallow buried explosives. I’m not aware that much of anything provides a clue, after the fact, about which direction it came from (unless perhaps there is a line of air blast damage or radiation burns from the lightning bolt).