Pytheas

Pytheas : biography - Pytheas took the altitude of the sun at Massalia at noon on the longest day of the year and...

Pytheas

Pytheas : biography - Circumstances of the voyage Pytheas was not the first Mediterranean mariner to reach the British Isles. The...

Ptolemy

Ptolemy : biography circa 90 - circa 168 Claudius Ptolemy ( , Klaudios Ptolemaios; ; AD 90 – AD 168) was a Greco-Roman...

Ptolemy

Ptolemy : biography circa 90 - circa 168 Maps based on scientific principles had been made since the time of Eratosthenes (3rd century BC), but...

Ptolemy

Ptolemy : biography circa 90 - circa 168 Footnotes Music Ptolemy also wrote an influential work, Harmonics, on music theory and the mathematics of music....

Ptolemy

Ptolemy : biography circa 90 - circa 168 Ptolemy's astrological outlook was quite practical: he thought that astrology was like medicine, that is conjectural, because...

Ptolemy

Ptolemy : biography circa 90 - circa 168 Background The name Claudius is a Roman nomen; the fact that Ptolemy bore it indicates he lived...

Erich von Drygalski

Erich von Drygalski : biography 9 February 1865 - 19 August 1949 Erich Dagobert von Drygalski (February 9, 1865 – January 10, 1949)...

Francis Galton

Francis Galton : biography 16 February 1822 - 17 January 1911 This work began in the 1880s while the Jewish scholar Joseph Jacobs studied anthropology...

Francis Galton

Francis Galton : biography 16 February 1822 - 17 January 1911 Sir Francis Galton, FRS ( 16 February 1822 – 17 January 1911),...