1648 (MDCXLVIII) was a leap year starting on Wednesday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1648th year of the Common Era (CE) and Anno Domini (AD) designations, the 648th year of the 2nd millennium, the 48th year of the 17th century, and the 9th year of the 1640s decade. As of the start of 1648, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
1648 in various calendars
1648
MDCXLVIII
2401
1097
ԹՎ ՌՂԷ
6398
1569–1570
1055
2598
2192
1010
7156–7157
丁亥年 (Fire Pig)
4345 or 4138
— to —
戊子年 (Earth Rat)
4346 or 4139
1364–1365
2814
1640–1641
5408–5409
1704–1705
1569–1570
4748–4749
11648
648–649
1026–1027
1057–1058
1569–1570
Gregorian minus 10 days
3981
264 before ROC
民前264年
180
2190–2191
阴火猪年
(female Fire-Pig)
1774 or 1393 or 621
— to —
阳土鼠年
(male Earth-Rat)
1775 or 1394 or 622
The year 1648 has been suggested as possibly the last time in which the overall human population declined, coming towards the end of a broader period of global instability which included the collapse of the Ming dynasty and the Thirty Years' War, the latter of which ended in 1648 with the Peace of Westphalia.[1]