The International Olympiad on Astronomy and Astrophysics (IOAA) is an annual astrophysics competition for high school students. Each national delegation is made up of at most five student competitors plus two leaders, selected on a national level.

International Olympiad on Astronomy and Astrophysics : Preparation   Syllabus of International Olympiad on Astronomy and Astrophysics. Useful Formulas for Astronomy and Astrophysics Olympiad

Astronomy Textbooks   "Fundamental Astronomy" by H. Karttunen, P. Kröger, H. Oja, M. Poutanen, Karl J. Donner "Astronomy: Principles and Practice" by A.E Roy and D. Clarke "Astronomy: Structure of the Universe" by A.E Roy and D. Clarke "The Physical Universe" by Frank Shu "An Introduction to Modern Astrophysics" by Bradley W. Carrol and Dale A. Ostile "Astronomy: A Physical Perspective" by Marc L. Kutner

"Schaum’s Outline of Astronomy" by Stacey Palen

"Universe" by Roger A. Freedman and William J. Kaufmann III

Physics   Textbooks   "Fundamentals of Physics" by Robert Resnick, Jearl Walker, David Halliday "An Introduction to Mechanics" by Kleppner and Kolenkow "Physics" by John D. Cutnell, Kenneth W. Johnson

Observational Textbooks and Software Stellarium Book of IAU Constellations Book of Messier Objects Sky and Telescope's Pocket Sky Atlas Telescope Mount

Past Papers