Abu Abdallah Muhammad Ibn Jabir Ibn Sinan Al-Battani. He is better known by the call of Al-Battani or Albatenius is a mathematician and also an astronomer. One result of his research that received world recognition is determining the length of the earth around the center of the solar system that studied for 42 years. Based on his calculations, he states that the earth surrounds the center of the solar system within 365 days, 5 hours, 46 minutes, and 24 seconds. The calculation is close to the last calculation that is considered more accurate.