The bacchanalia are wild and mystic festivals of the Roman god Bacchus which are introduced into Rome from lower Italy by way of Etruria (approximate date).
Roman artists begin trying to produce the illusion of thin slabs of colored marble covering the walls, which are set off by actual architectural moldings and columns, in private houses. These attempts last for 120 years.
Astronomy
The first good measurement of the distance between Earth and the Sun is made by Eratosthenes (approximate date). By studying lunar eclipses, his result is roughly 150 000 000 km. The currently accepted value is 149 597 870 691 ± 30 metres.