Curated OER
Astronomer Research
Students discover the contributions of early astronomers and scientists. In this research skills lesson, students research electronic and print sources about Galileo Galilei, Aristarchus, Hipparchus, Claudius Ptolemy, Nicholas...
University of St. Andrews (UK)
University of St. Andrews: Christopher Clavius
This site, which is provided for by the University of St. Andrews, gives a brief biography of Christopher Clavius with references for additional study.