Science & Discovery in the 4th century

13 sourced entries, 320 CE to 394 CE, oldest first. Also see Science & Discovery across every century or everything else in the 4th century.

• 320October 18 – Pappus of Alexandria, Greek philosopher, observes an eclipse of the sun and writes a commentary on The Great Astronomer (Almagest).source
• 351In India, a new process makes possible the extraction of sugar from sugarcane.source
• 352The earliest sighting of a supernova occurs in China.source
• 354The Roman Calendar of 354, an illuminated manuscript, is drawn up and becomes the earliest dated codex.source
• 363April 20 – The planet Venus occults the planet Jupiter.source
• 364Theon of Alexandria, Greek mathematician, observes a solar eclipse (June 16) and a lunar eclipse (November 25).source
• 366The Tabula Peutingeriana, a map showing Roman possessions and roads, is created about this time.source
• 367In the region of the constellation Perseus, a star not visible to the naked eye, and 1,533 light years distant from Earth, explodes in a nova. The light from the star, now called GK Persei, was first detected on Earth on February 21, 1901.source
• 380Important works on mathematics and astronomy are written in Sanskrit.source
• 385Ammianus Marcellinus begins writing a history, in the style of Tacitus, covering the years AD 96–378.source
• 387Oribase, Greek doctor, publishes a treatise on paralysis and bleedings.source
• 393Chinese astronomers observe the guest star SN 393.source
• 394The last known hieroglyphic inscription, known as the Graffito of Esmet-Akhom, is written in Philae, Egypt.source