" Fundamental Astronomy " by Hannu Karttunen et al. is a comprehensive, widely used undergraduate textbook and reference that covers topics from celestial mechanics to modern astrophysics. Now in its 6th edition, this authoritative text combines foundational concepts with updated scientific research.
You can purchase or rent copies of the textbook from Springer Nature and Walmart . Fundamental Astronomy, (Paperback) - Walmart.com Fundamental Astronomy