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Imagine that the air above the Earth is perfectly still, and we're inside a one thousand-foot long machine somewhere in that air. It's an antigravity machine, so we can't feel any motion, and it's too foggy to see anything through the windows either. We can't step outside because we might be flying a million miles per hour, but we can stick different instruments out there through some little doors.
We want to know how we are traveling compared to the fixed air. I can think of some tools. Before reading on, see if you can come up with a way. Any ideas?
Here are three possibilities:
1. We can stick a weathervane up through the roof with one of those things looking like four spinning ice cream scoops a weather station uses to measure the wind.
The vane will stay lined up with the wind and give us the direction, and the scoops will give us our speed. Using a vane is probably the most direct method possible.
2. A little more indirect way is to stick a gun out on the front of the ship and an ear piece out near the back end.
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