Picture of Hipparchus Hipparchus was a Greek astronomer who
lived between 190-120 B.C. He created the first accurate star
map and kept a catalogue of over 850 stars with their relative
magnitudes. The system of epicycles describing planetary motion
was developed by Hipparchus, and helped preserve the geocentric
model of the universe. His estimates of the moon's size and
distance relative to Earth were also remarkably accurate for his
time. Hipparchus is considered the founder of trigonometry for
his work with the lengths of chords traced out by angles in a
circle. His table of chords was the forerunner to modern trig
tables. Shop Windows to the Universe Science Store! Learn about
Earth and space science, and have fun while doing it! The games
section of our online store includes a climate change card game
and the Traveling Nitrogen game You might also be interested in:
How did life evolve on Earth? The answer to this question can
help us understand our past and prepare for our future. Although
evolution provi