999999999 s to yr conversion result above is displayed in three different forms: as a decimal (which could be rounded), in scientific notation (scientific form, standard index form or standard form in the United Kingdom) and as a fraction (exact result). Every display form has its own advantages and in different situations particular form is more convenient than another. For example usage of scientific notation when working with big numbers is recommended due to easier reading and comprehension. Usage of fractions is recommended when more precision is needed.
If we want to calculate how many Years are 999999999 Seconds we have to multiply 999999999 by 1 and divide the product by 31556952. So for 999999999 we have: (999999999 × 1) ÷ 31556952 = 999999999 ÷ 31556952 = 31.688738475123 Years
So finally 999999999 s = 31.688738475123 yr