by S. Mohammad Mozaffari Published on: 23rd November 2020
The orbital elements of each planet are the eccentricity and the direction of the apsidal line of its orbit defined by the ecliptic longitude of either of its apses, i.e., the two points on its…
by S. Mohammad Mozaffari Published on: 5th November 2020
The present paper introduces, investigates, analyses, and comments on an anonymous treatise in Persian named al-Risāla al-Ghāzāniyya fi ’l-ālāt al-raṣadiyya, “Ghāzān’s (or Ghāzānid) treatise on the observational instruments”, which describes the structure, construction, and functions…
by S. Mohammad Mozaffari Published on: 17th October 2020
This paper deals with an optical aid named barbakh that Abū al-Rayḥān al-Bīrūnī (973–1048 CE) proposes for facilitating the observation of the lunar crescent in his al-Qānūn al-Mas‘ūdī VIII.14. The device consists of a long…
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