The 1800s (pronounced "eighteen-hundreds") was a decade of the Gregorian calendar that began on 1 January 1800, and ended on 31 December 1809. The term...

1800s may refer to: The century from 1800 to 1899, almost synonymous with the 19th century (1801–1900) 1800s (decade), the period from 1800 to 1809 This...

the 100th and last year of the 18th century, and the 1st year of the 1800s decade. As of the start of 1800, the Gregorian calendar was 11 days ahead of...

2nd millennium, the 3rd year of the 19th century, and the 4th year of the 1800s decade. As of the start of 1803, the Gregorian calendar was 12 days ahead of...

2nd millennium, the 7th year of the 19th century, and the 8th year of the 1800s decade. As of the start of 1807, the Gregorian calendar was 12 days ahead of...

into Audubon Nature Institute. The Aquarium followed in 1990. In the next decade, the Aquarium expanded into a new wing housing a theater and a Changing...

2nd millennium, the 5th year of the 19th century, and the 6th year of the 1800s decade. As of the start of 1805, the Gregorian calendar was 12 days ahead of...

each decade, century, and millennium from 13,000 BC to AD 3000. 0s BC is not a true decade, as it contains only nine years. AD 0s is not a true decade, as...

2nd millennium, the 4th year of the 19th century, and the 5th year of the 1800s decade. As of the start of 1804, the Gregorian calendar was 12 days ahead of...

2nd millennium, the 6th year of the 19th century, and the 7th year of the 1800s decade. As of the start of 1806, the Gregorian calendar was 12 days ahead of...