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A new calendar was adopted as Sosigenes of Alexandria found each solar year to contain 365.25 days. Accounting for the extra 6 hours, Sosigenes recommended the addition of a day every 4 years.
Claudius Ptolemy
A strong believer in the geocentric theory, Ptolemy hypothesized that each planet had a layer encircling Earth.
Listing 48 constellations, his work Almagest (an astronomical manual) also described the trigonometry needed to predict the locations of the Sun, Moon, and planets.
1. Galen, a Roman surgeon, educated himself about the human body by dissecting animals.
2. Marcus Terentius Varro proposed that disease was spread through creatures that are not visible to the naked eye.
3. Battlefield surgeon pioneered tools used for minimizing blood loss while others employed anesthetics during surgery.
4. Using math and astronomy, the Romans calculated how many days are in a solar year and added the leap year.
5. Ptolemy used math to support his theory of a geocentric universe although it was flawed.