Mathematicians Of The Day
21st March
On this day in 1684, Giovanni Cassini discovered two moons of Saturn: Tethys and Dione. He had previously discovered two other satellites of Saturn: Iapetus (in 1671) and Rhea (in 1672). Christiaan Huygens was the first to discover a moon of Saturn, when he viewed Titan (the largest and easiest to see) in 1655.
A (personally designed) stamp of one of today's mathematicians is at THIS LINK.
A (personally designed) stamp of one of today's mathematicians is at THIS LINK.
Click on Ⓟ for a poster.
Born:
- 1768: Joseph Fourier Ⓟ
- 1831: Dorothea Beale Ⓟ
- 1855: Louis Raffy
- 1863: James Watt
- 1884: George Birkhoff Ⓟ
- 1920: John Hammersley Ⓟ
Died:
- 1762: Nicolas-Louis de Lacaille Ⓟ
- 1822: Charles Tinseau
- 1933: Enrico D'Ovidio Ⓟ
- 1934: Thomas Muir Ⓟ
- 1952: John Alison
- 1960: Sheila Scott Macintyre Ⓟ
- 2009: Thierry Aubin Ⓟ
- 2010: Fritz Grunewald Ⓟ
- 2020: Volodymyr Petryshyn Ⓟ
Quotation of the day
From Joseph Fourier
The differential equations of the propagation of heat express the most general conditions, and reduce the physical questions to problems of pure analysis, and this is the proper object of theory.