Institution: | 1. Department of Mathematics, Faculty of Physical Sciences, Ahmadu Bello University, Zaria, Nigeria;2. Department of Mathematical Sciences, Faculty of Physical Sciences, Federal University Dutsin-Ma, Katsina State, Nigeria;1. Astronomy Department, National Research Institute of Astronomy and Geophysics (NRIAG), 11421 Helwan, Cairo, Egypt;2. Kottamia Center of Scientific Excellence in Astronomy and Space Science (KCScE, STDF, ASRT), Cairo, Egypt |