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326-IM-0016A-0362
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Gemini-9 will Make 96 Minute Revolutions, 90-Minute Orbits!
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- 0000-00-00 (Creation)
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The Times of Ceylon Press
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Washington — America's Gemini-9 spacecraft will complete about 15 revolutions around the earth daily — one revolution about every 96 minutes during its three-day mission. Yet it will make about 16 orbits daily!
The distinction between revolutions and orbits is this: A revolution is made each time the craft passes a given point on the earth's surface, whereas an orbit is completed each time the craft passes a point in space.
Each time the Gemini-9 passes above 80 degrees west longitude — the meridian of its point of origin at Cape Kennedy, Florida — it registers one revolution, because the craft travels in the direction of the earth's rotation, it has to make more than a full 360-degree circle (or orbit) to catch up to the 80-degree meridian — since at the same tine the earth will have moved about 22.5 degrees.
If the earth stood still, Gemini- would require only 90 minutes to circle it. Thus 90 minutes — one complete circle — is the period of one orbit.
The distinction between revolutions and orbits is this: A revolution is made each time the craft passes a given point on the earth's surface, whereas an orbit is completed each time the craft passes a point in space.
Each time the Gemini-9 passes above 80 degrees west longitude — the meridian of its point of origin at Cape Kennedy, Florida — it registers one revolution, because the craft travels in the direction of the earth's rotation, it has to make more than a full 360-degree circle (or orbit) to catch up to the 80-degree meridian — since at the same tine the earth will have moved about 22.5 degrees.
If the earth stood still, Gemini- would require only 90 minutes to circle it. Thus 90 minutes — one complete circle — is the period of one orbit.
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- The Times of Ceylon Press (Creator)
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June 9, 2015 1:18 AM