1846 — Neptune is found where the maths said it would be
Johann Galle pointed a telescope at the spot Urbain Le Verrier had calculated and found the planet within an hour, less than one degree from the prediction. It is the clearest case there is of arithmetic discovering something real.
Questions to work through
Put 1846 on a timeline with two other dates you already know.
Find one person named here and write three sentences about what they did next.
Why do you think this was worth remembering? Would you have chosen it?
Find something that happened on this day in your own family. Ask somebody older.