Data from his Observatory allowed Ulugh Beg to calculate the length of the year as 365 days 5 hours 49 minutes 15 seconds, a fairly accurate value.
Data mula sa kanyang obserbatoryo pinahihintulutan Ulugh humingi na kalkulahin ang haba ng taon bilang 365 araw 5 oras 49 minuto 15 segundo, ng isang pantay-wastong halaga.