Year
In astronomy, the Julian year is a unit of time; it is defined as 365.25 days of exactly 86,400 seconds (SI base unit), totalling exactly 31,557,600 seconds in the Julian astronomical year.
Middle-earth
The Appendices make several references in both history and etymology of topics 'now' (in modern English languages) and 'then' (ancient languages);
The year no doubt was of the same length,¹ ["the footnote here reads": 365 days, 5 hours, 48 minutes, 46 seconds.] for long ago as those times are now reckoned in years and lives of men, they were not very remote according to the memory of the Earth.