Al-Battani / Batani from Damascus discovered how long a solar year was, only missing the correct value by 2 minutes 22 seconds.
Al-Battani/Batani kutoka Dameski aligundua ni jinsi mwaka, uliohesabiwa kutegemea jua, ulivyokuwa mrefu, lakini alikosea thamani ya urefu wake halisi kwa dakika 2 na sekunde 22.