how many nanoseconds are there in one second?
Asker's rating. 1  1 nanosecond = 1/10^9 of a second. No. of seconds in an year = 365 x 24 x 60 x 60 = 31536000 s. 2  nanosecond = 1 billionth of a second = 1 billion nanoseconds in 1 second. year = 365/366 (leap year) days. 3  the answer is 3.1536 x 10^16. puma Â· 9 years ago. 4  3.1536 x 10^16 - normal Year.