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Internetseite des Argelander Instituts fuer Astronomie der Universitaet Bonn

Transits of Venus were used to determine the distance of the sun

World history of astronomy and timekeeping with updates, and origins, based on original sources and places where possible.

Images from the history of astronomy, old telescopes, pictures of astronomers, observatories.

Home page of Raymond Mercier

Observatory from 1642, a great view of old Copenhagen. Exhibitions and music.

telescope history, antique telescopes, archaeoastronomy, ancient astronomy, old telescopes

Exposing Muslims to free market thought and the value of liberty to Islam; educating non Muslims about Islamic beliefs, practices, and contributions.