Yep, just think about launching a rocket ship.
When it's pointed up it's ready to blast off.
When the launch is horizontal, it's shut down.
Tom, we need to analyze the rocket ship analogy.
So what happens if the rocket ship is sitting on the equator and needs to go east or west? MMMMMMM, you say. Then the quickest way would be to launch horizontal to go east-west.
So now when the earth turns 90 degrees, what was ready to go east-west is now ready to blast off north.
Geeez, its not rocket science