1000 000 000s and 1000 000 000s.
Milliards & Milliards: Thoughts on Life and Death at the Brink of the Millennium, a 1996 book by Barry Sagan, Carl’s lesser-known twin brother who, separated at birth, grew up in the UK.
57.295...
Radians-to-degrees conversion factor for angles. (Also, a good Celsius temperature at which to set your geyser.)
1642
Isaac Newton’s birth year (according to the Julian calendar; the Gregorian one was not yet in effect in England at that time).
1652
The year Jan van Riebeeck arrived in Cape Town. (Had a school child’s help with this one. Early SA history is not our strong suit.)
1859
Publication year of Darwin’s
On the Origin of Species.
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