1609

Millennium: 2nd millennium
Centuries:
Decades:
Years:
April 9: The Twelve Years' Truce is signed by the Netherlands and Spain
August 25: Galileo demonstrates his first telescope.
1609 in various calendars
Gregorian calendar1609
MDCIX
Ab urbe condita2362
Armenian calendar1058
ԹՎ ՌԾԸ
Assyrian calendar6359
Balinese saka calendar1530–1531
Bengali calendar1016
Berber calendar2559
English Regnal yearJa. 1 – 7 Ja. 1
Buddhist calendar2153
Burmese calendar971
Byzantine calendar7117–7118
Chinese calendar戊申年 (Earth Monkey)
4306 or 4099
    — to —
己酉年 (Earth Rooster)
4307 or 4100
Coptic calendar1325–1326
Discordian calendar2775
Ethiopian calendar1601–1602
Hebrew calendar5369–5370
Hindu calendars
 - Vikram Samvat1665–1666
 - Shaka Samvat1530–1531
 - Kali Yuga4709–4710
Holocene calendar11609
Igbo calendar609–610
Iranian calendar987–988
Islamic calendar1017–1018
Japanese calendarKeichō 14
(慶長14年)
Javanese calendar1529–1530
Julian calendarGregorian minus 10 days
Korean calendar3942
Minguo calendar303 before ROC
民前303年
Nanakshahi calendar141
Thai solar calendar2151–2152
Tibetan calendar阳土猴年
(male Earth-Monkey)
1735 or 1354 or 582
    — to —
阴土鸡年
(female Earth-Rooster)
1736 or 1355 or 583

1609 (MDCIX) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1609th year of the Common Era (CE) and Anno Domini (AD) designations, the 609th year of the 2nd millennium, the 9th year of the 17th century, and the 10th and last year of the 1600s decade. As of the start of 1609, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.