645 BC

Calendar year

Millennium:	1st millennium BC
Centuries:	8th century BC 7th century BC 6th century BC
Decades:	660s BC 650s BC 640s BC 630s BC 620s BC
Years:	648 BC 647 BC 646 BC 645 BC 644 BC 643 BC 642 BC

Politics
645 BC by topic
State leaders Political entities
Categories
Deaths
v t e

645 BC in various calendars
Gregorian calendar	645 BC DCXLV BC
Ab urbe condita	109
Ancient Egypt era	XXVI dynasty, 20
- Pharaoh	Psamtik I, 20
Ancient Greek era	33rd Olympiad, year 4
Assyrian calendar	4106
Balinese saka calendar	N/A
Bengali calendar	−1237
Berber calendar	306
Buddhist calendar	−100
Burmese calendar	−1282
Byzantine calendar	4864–4865
Chinese calendar	乙亥年 (Wood Pig) 2053 or 1846 — to — 丙子年 (Fire Rat) 2054 or 1847
Coptic calendar	−928 – −927
Discordian calendar	522
Ethiopian calendar	−652 – −651
Hebrew calendar	3116–3117
Hindu calendars
- Vikram Samvat	−588 – −587
- Shaka Samvat	N/A
- Kali Yuga	2456–2457
Holocene calendar	9356
Iranian calendar	1266 BP – 1265 BP
Islamic calendar	1305 BH – 1304 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	1689
Minguo calendar	2556 before ROC 民前2556年
Nanakshahi calendar	−2112
Thai solar calendar	−102 – −101
Tibetan calendar	阴木猪年 (female Wood-Pig) −518 or −899 or −1671 — to — 阳火鼠年 (male Fire-Rat) −517 or −898 or −1670

The year 645 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 109 Ab urbe condita . The denomination 645 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.

Events

The Spring and Autumn Annals, a Chinese book of records, mentions that on December 24 of this year there were five meteors in the sky. It was the first Chinese observation of meteors.