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Headword Date Article Type
Alvan Clark observes Sirius B 1862 Context Note
Henry Morton Stanley meets David Livingstone 1871 Context Note
Yellowstone National Park founded 1872 Context Note
Henry J Heinz begins to produce and advertise tomato ketchup 1876 Context Note
Chemical thermodynamics developed 1876 Context Note
Phonograph invented by Thomas Edison 1877 Context Note
Grand Canyon surveyed 1881 Context Note
Alternating current transformer invented by William Stanley 1885 Context Note
Dr Pemberton produces Coca-Cola 1886 Context Note
Great Blizzard 1888 Context Note
Stellar interferometer proposed by Albert Michelson 1890 Context Note
Spectroheliograph developed by George Hale 1892 Context Note
The boll weevil arrives in Texas 1892 Context Note
San Francisco Earthquake 1906 Context
Determination of Earth’s age 1907 Context Note
Henrietta Leavitt discovers the Cepheid period-luminosity relation 1908 Context Note
George Hale discovers the Zeeman splitting of spectral lines from sunspots 1908 Context Note
Charles Doolittle Walcott discovers the Burgess Shale Cambrian fossil site 1909 Context Note
Explorers Robert Peary and Matthew Henson reportedly reach the North Pole 1909 Context Note
Relation between magnitudes and spectral types of stars studies by Ejnar Hertzsprung and Henry Russell 1910 Context Note

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