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[i]However, the orbits of the X-37B and Tiangong 1 differ greatly — by about 100 degrees — in a parameter called right ascension, which describes where a craft crosses the equator, Weeden said. So the two satellites actually take disparate paths around the globe, with their orbits intersecting just twice per circuit.
That means that the X-37B and Tiangong 1 could theoretically approach each other a maximum of two times per orbit, if the timing works out perfectly. And even then, they'd scream past each other at very high speeds — not exactly optimum conditions for a spy mission.[/i]
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