If Time since the first passenger steam railway service (199 y) was a standard unit ...
Time since first humans in Australia (50,000 y)...more would be 250 x Time since the first passenger steam railway service
Time since earliest wheeled vehicles (4,000 y)...more would be 20 x Time since the first passenger steam railway service
Time since the birth of Hero of Alexandria (2,014 y)...more would be 10 x Time since the first passenger steam railway service
Time since the birth of Omar Khayyam (976 y)...more would be 5 x Time since the first passenger steam railway service
Time since the first iron steamship crossed the English Channel (202 y)...more would be about as big as Time since the first passenger steam railway service
Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)...more would be 2/5 of Time since the first passenger steam railway service
Lifespan of human being (80 y)...more would be 2/5 of Time since the first passenger steam railway service
Time since first Apple Macintosh Computer launched (40 y)...more would be 1/5 of Time since the first passenger steam railway service
Time since first Tesla Model S launched (10 y)...more would be 1/20 of Time since the first passenger steam railway service
Lifespan of rat (2 y)...more would be 1/100 of Time since the first passenger steam railway service
Is That A Big Number? - The Book
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
