Physics
The Greek philosopher Plato founds his school, the Academy, at Athens and begins his trilogy, Timaeus, Critias, and Hemocrates, finishing only Timaeus, in which he expounds his theory of four elements -- earth, water, air, and fire -- and hints at a fifth element, the ether. See also 450 bce Physics. (See biography.)
ToolsPlato is said to build an "alarm clock" to wake up his students. According to one account, it is a clepsydra that consists of a vessel slowly filling with water and in which floats a bowl with lead balls. When the bowl reaches the rim of the vessel, it topples over and the lead balls fall on a copper plate. Another reconstruction has Plato using two jars and a siphon. Water slowly empties through the night until it reaches the siphon, whereupon it swiftly is transported via the siphon to the other jar. Water rising in the other jar forces air through a whistle, sounding the alarm. See also 1380 bce Tools.
| 387 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 387 BC |
| Ab urbe condita | 367 |
| Armenian calendar | N/A |
| Assyrian calendar | 4364 |
| Bahá'í calendar | -2230–-2229 |
| Bengali calendar | -979 |
| Berber calendar | 564 |
| English Regnal year | N/A |
| Buddhist calendar | 158 |
| Burmese calendar | -1024 |
| Byzantine calendar | 5122–5123 |
| Chinese calendar | 癸巳年 (2250/2310) — to —
甲午年(2251/2311) |
| Coptic calendar | -670–-669 |
| Ethiopian calendar | -394–-393 |
| Hebrew calendar | 3374–3375 |
| Hindu calendars | |
| - Vikram Samvat | -330–-329 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2715–2716 |
| Holocene calendar | 9614 |
| Iranian calendar | 1008 BP – 1007 BP |
| Islamic calendar | 1039 BH – 1038 BH |
| Japanese calendar | |
| Julian calendar | |
| Korean calendar | 1947 |
| Minguo calendar | 2298 before ROC 民前2298年 |
| Thai solar calendar | 157 |
| Wikimedia Commons has media related to: 387 BC |
Year 387 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Papirius, Fidenas, Mamercinus, Lanatus and Poplicola (or, less frequently, year 367 Ab urbe condita). The denomination 387 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
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