| 21. | After this passage the comet will have a 391-year orbital period.
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| 22. | The title track is from the album " Orbital Period ".
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| 23. | In 1937 it passed close to Jupiter which increased its orbital period slightly.
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| 24. | The orbital periods of LMXBs range from ten minutes to hundreds of days.
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| 25. | The orbital period that should be used is actually slightly longer.
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| 26. | The secondary body has a orbital period of 21.67 hours.
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| 27. | The binary system has an orbital period of 15.8 days.
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| 28. | Hence velocities are halved and orbital periods remain the same.
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| 29. | The Applegate mechanism explains long term orbital period variations seen in certain eclipsing binaries.
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| 30. | Its orbital period is 760 years; the two components are currently moving farther apart.
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