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.

Click on for a poster.


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.
Analytical Theory of Heat