Hipparchus of Rhodes or Hipparchus of Nicaea (190-120 BC) was a Greek astronomer, geographer, cartographer and mathematician. People call him “the father of astronomy”.
In the 2nd century BC he calculated that the solar year is 365.242 days.
In 143 BC Hipparchus set the basis of Astronomy because he claimed that the stars aren’t eternal on the sky.
Hipparchus has invented the astrolabe.
He perfected the Dioptra
and other older instruments like the hourglass
the links (rings)
the solid ball and the sundial
He was also the first person who made the terrestrial globe.
In 2006 a research team announced that a group of toothed wheels inside the mechanism represented the moon’s speed. They believe that Hipparchus was involved with the construction of that instrument.
Finally, he created the first star catalogue, which unfrotunately has been lost.
Jenny Kipourgou, Grade 2, Level 2, 2nd Junior High School of Paralia