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Yén (plural yéni) is Quenya for "long year", and was a unit of time used by the Elves of Middle-earth before the first rising of the Sun. Compare with a Valian Year, the unit of time used in Valinor.
- 1 yén = 144 solar years = 52,596 days
Tolkien used Valian Years to measure the passing of time in the Elder Days as recorded in the Annals of Aman, but such a Valian Years equals 9.582 solar years = 3500 days (in older versions, the Annals of Valinor, it equals 10 solar years).