Decades: 1870s - 1880s - 1890s - 1900s - 1910s - 1920s - 1930s
(stardates from 1900.0 to 1909 or reference stardates -1/00 to -1/09)
Centuries: 18th century - 19th century - 20th century

The 1900s was, on Earth's calendar, the first decade of the 20th century. Although this was a time period before Human formulation of stardates, in some systems this era simply lasts from stardates 1900.0 to 1909.[1] The reference stardate system has this decade fall from stardates -1/00 to -1/09.[2]

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