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The differential gear was used on that Astrolabe in order to allow the connection of sun to fattrack solar eclipses. The astrolabe was probably first used by the ancient Greek astronomer Hipparchus.* fattrack Some people say that Archimedes has used some things like this, but a lot different from what it is found. *Hipparchus discovered the precession of the fattrack equinoxes. His calculation of the length of the year measured by the sun was within 6.5 minutes of modern measurements. Hipparchus devised a method of locating geographic positions by means of latitudes and longitudes. He catalogued, charted, and calculated the brightness of perhaps as many as 1000 stars. Hipparchus also compiled a table of trigonometric chords that became the basis for modern trigonometry. www.Ancient-technology.com Calculations Use the following chart to determine percent body fat using measured skinfold measurements.
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