Science & Discovery in the 2nd century BC

8 sourced entries, 164 BCE to 102 BCE, oldest first. Also see Science & Discovery across every century or everything else in the 2nd century BC.

• 164 BCEHalley's Comet makes its regular appearance in the sky, as recorded by a Babylonian scribe. It last appeared in 240 BC.source
• 146 BCEHipparchus determines the equinoctial point.source
• 145 BCEHipparchus determines the length of the tropical year.source
• 134 BCEHipparchus discovers the precession of the equinoxes.source
• 134 BCEHipparchus creates a star catalogue.source
• 130 BCERoman census carried out by Quintus Pompeius and Quintus Caecilius Metellus Macedonicus.source
• 129 BCETotal solar eclipse, used by Hipparchus to estimate distance to the Moon.source
• 102 BCEMarcus Marius was likely elected praetor for 102 BC.source