Avila, Ruben, and Shoaib Raza Syed. “On the Elliptical Orbit of the Earth and Position of the Sun in the Sky: An Engineering Approach”. The Nucleus 61, no. 1 (January 2, 2024): 10–15. Accessed December 11, 2024. http://thenucleuspak.org.pk/index.php/Nucleus/article/view/1330.