When they had settled in their orbit and the jet was again silent, Matt and Oscar thanked the captain and went back to their proper seats. Tex and Pete were both asleep; Oscar followed suit at once. Matt decided that he must have missed quite a bit in letting himself be talked out of finishing his leave in Texas.
His thoughts went back-to the problem he had been considering. Certainly he had not decided to stick simply because his own leave had been fairly quiet; he had never thought of home as being a nightclub, or a fair ground.
One night at dinner his father had asked him to describe just what it was that the Nobel did in circum-Terra patrol. He had tried to oblige. "After we lift from Moon Base we head for Terra on an elliptical orbit. As we approach the Earth we brake gradually and throw her into a tight circular orbit from pole to pole-"
"Why pole to pole? Why not around the equator?"
"Because, you see, the atom-bomb rockets are in pole-to-pole orbits. That's the only way they can cover the whole globe. If they were circling around the equator-"
"I understand that," his father had interrupted, "but your purpose, as I understand it, is to inspect the bomb rockets. If you-your ship-circled around the equator, you could just wait for the bomb rockets to come past."
Tow may understand it," his mother had said to his father, "but Z don't."
Matt looked from one to the other, wondering which one to answer-and how. "One at a time . . . please," he protested. "Dad, we can't just intercept the bombs; we have to sneak up on them, match orbits until you are right alongside it and making exactly the same course and speed. Then you bring the bomb inside and ship and inspect it."
"And of what does that inspection consist?"
"Just a sec, Dad. Mother, look here for a moment." Matt took an orange from the table's centerpiece. "The rocket bombs go round and round, like this, from pole-to-pole, every two hours. In the meantime the Earth is turning on its axis, once every twenty-four hours." Matt turned the orange slowly in his left hand while moving a finger of his right hand rapidly around it from top to bottom to simulate a pole-to-pole bomb. "That means that if a bomb passes over Des Moines on this trip, it will just about pass over the Pacific Coast on its next trip. In twenty-four hours it covers the globe."