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" ... that the mean longitude of the first satellite, minus three times that of the second, plus twice that of the third, is always equal to two right angles. "
On the Connexion of the Physical Sciences - Page 29
by Mary Somerville - 1834 - 458 pages
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The Library of Original Sources: Volume VI (Advance in Knowledge 1650-1800)

Oliver J. Thatcher - 2004 - 466 pages
...attraction rendered this ratio rigorously exact, and it has moreover made the mean longitude of the first minus three times that of the second, plus twice that of the third, equal to a semicircumference. At the same time, it gave rise to a periodic inequality, which depends...
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