On this day, in 1787, Sir William....

On this day, in 1787, Sir William Herschel discovers two moons of Uranus.

His arms are Argent, on a mount Vert, the forty-foot reflecting telescope with its apparatus directed to sinister, all Proper.  On a chief Azure, the astronomical symbol of Uranus irradiated Or.
Crest :   On a demi terrestrial sphere Proper,  an eagle rising Or.
Motto :   Coelis Exploratis.

http://www.numericana.com/arms/herschel.htm

Coat-of-arms of Sir William Herschel (1738-1822) - Numericana