The domain of natural science that studies celestial objects and phenomena is known as astronomy. This discipline aims to study the evolution and origin of astronomical object such as planets, moons, galaxies, comets, stars, nebulae, etc. The branch of astronomy concerned with the recording of data of the observable universe using physical models is known as observational astronomy. Theoretical astronomy describes astronomical objects and astronomical phenomena using analytical models of physics and chemistry. There are various sub-fields in astronomy, such as astrophysics, astrobiology, physical cosmology, astrochemistry, solar astronomy, stellar astronomy, etc. This book attempts to understand the multiple branches that fall under the discipline of astronomy and how such concepts have practical applications. The topics included herein are of utmost significance and bound to provide incredible insights to readers. This book aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.