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Astrophysics II
Covered topics are: What is a Galaxy?, Gravitational Potentials, Orbits in Spherical Potentials and Integrals, Orbits in Axisymmetric Potentials, Epicyclic Approximation, Equilibria of Stellar Systems, Boltzmann Equation, Jeans' Equations in Spherical Coordinates, Jeans' Equations Applied, Jeans' Theorem, Stability: Jeans Mass and Spiral Structure, Gravitational Mirages (aka lenses) via Fermat's Principle, Applied Gravitational Lensing, Weak Lensing, Clusters of Galaxies, The Sunyaev-Zeldovich Effect, Cosmological Parameters, Growing Modes in Expanding Universes: Jeans Redux.
Author(s): Prof. Paul Schechter
NA Pages 
Introduction to Astronomy by Prof. Saul Rappaport
This note provides a quantitative introduction to the physics of the solar system, stars, the interstellar medium, the galaxy, and the universe, as determined from a variety of astronomical observations and models.
Author(s): Prof. Saul Rappaport
NA Pages
Introduction to Astronomy Lectures
This book covers the following topics: Orbits and Light, Spectroscopy, Telescopes, Solar System, Planetary System Formation, The Sun, Properties of Stars, Interstellar Medium, Star Formation, Stellar Evolution.
Author(s): John Scalo
NA Pages
Modern Astronomical Techniques
This note is a survey of observational astronomy across the electromagnetic spectrum. Topics covered includes: overview of current telescopes at all wavelengths, CCD basics, S/N and integration time, some basic concepts, Optical and UV, Telescopes and instruments, FITS data and optical data reduction, Infrared and X-ray, Data archives, object catalogs/databases, Statistics and regression analysis, Hard X-ray and Gamma-ray, Radio, interferometry basics, Non-photon signals: neutrinos, cosmic rays, gravity waves.
Author(s): Tesla Jeltema
NA Pages
An Introduction to Astronomy by Helen Johnston
This astronomy note introduces you to the wonders of modern astronomy.From the Solar System to the most distant galaxies, we undertake an eye-opening journey, from how stars work to the structure of the universe itself.
Author(s): Helen Johnston
NA Pages