the 15th century
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It is: 1440
No. 4 is less than 1440 so it cannot be divisible by 1440. Unless we use decimals, in which case 4/1440 = 0.0027778.
There are: 1440/60 = 24 minutes in 1440 seconds.
sqrt(1440) = 37.9473319
80% of 1440 is 1152.