.AT 17 mins and 40 seconds past eight in the evening, Greenwich Method Time, on July 20th it will certainly be exactly 55 years because Neil Armstrong arrived at the Moon. Those 55 years amount to 20,089 times. Of those, 20,062 were 86,400 seconds long and 27 one 2nd longer because of the enhancement of surge seconds, a practice begun in 1972.
So those 55 years will amount to 1,735,689,627 secs.