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Mayan astronomers discover an 18.7-year cycle in the rising and setting of the Moon.From this they created the first almanacs – tables of the movements of the Sun, Moon, and planets for the use in astrology.
An important contribution by Islamic astronomers was their emphasis on observational astronomy. [49] This led to the emergence of the first astronomical observatories in the Muslim world by the early 9th century. [50] [51] Zij star catalogues were produced at these observatories.
Fleming went on to help develop a classification of stars based on their hydrogen content, as well as play a major role in discovering the strange nature of white dwarf stars. [8] Williamina continued her career in astronomy when she was appointed Harvard's Curator of Astronomical Photographs in 1899, also known as Curator of the Photographic ...
The discoveries of elements radium and polonium were made by Polish chemist Marie Curie through the deep study of their nature and their compounds. Rhenium Rhenium, a d-block transition metal with Atomic number 75, was first isolated by Ida Noddack and her husband. The existence of this element was predicted by Dmitri Mendeleev. Ida Noddack was ...
In another eclipse in 1869, astronomers found convincing evidence of another new element, which they nicknamed coronium—before learning a few decades later that it was not a new element, but ...
In 1898, she was appointed Curator of Astronomical Photographs at Harvard, the first woman to hold the position. [13] At the 1893 World's Fair in Chicago, Fleming openly advocated for other women in the sciences in her talk "A Field for Woman's Work in Astronomy", where she openly promoted hiring female assistants in astronomy. Her speech ...
Martha P. Haynes (born 1951), American astronomer specialized in radio astronomy and extragalactic astronomy; Martha Locke Hazen (1931-2006), American astronomer; E. Ruth Hedeman (1910–2006), American solar astronomer; Mary Lea Heger (1897–1983), American astronomer who studied the interstellar medium; Charlene Heisler (1961-1999), Canadian ...
Bolas – bolas are a type of throwing weapon made of weights on the ends of interconnected cords and were initially used to capture animals via the entanglement of their legs. Bolas were used in the Andes and Patagonia where indigenous peoples–particularly the Tehuelche–used them to catch 200-pound guanaco and ñandú .