This is a table of contents for my notes on astrophysics. The posts are arranged in an order that might be found in a textbook.

- Sidereal and synodic periods of planets
- Astronomical coordinates - declination and right ascension
- Julian dates
- Angular distances on the celestial sphere

- Ellipses
- Orbits in the centre of mass frame - energy and angular momentum
- Kepler's laws
- Kepler's third law and satellite orbits
- Kepler's third law and the moons of Jupiter
- Halley's comet - numerical calculation of orbit
- Halley's comet - an application of Kepler's laws
- Elliptical orbits - numerical simulation
- Velocity in an elliptical orbit
- Orbital velocities at perihelion and aphelion
- Mars's orbit - ellipse versus circle
- Oppositions of Mars - numerical calculation
- Escape speed
- Virial theorem for gravitational orbits

- Parallax and the distance to Mars
- Solar irradiance
- Apparent and absolute magnitude
- Bolometric magnitudes and colour indices
- Stellar parallax and the parsec
- Apparent and absolute magnitudes - relation to flux
- Solar sails
- Blackbody radiation rate
- Dschubba (Delta Scorpii) - a blackbody model
- Blackbody radiation - classical approximations
- Blackbody radiation in the frequency domain
- Stefan-Boltzmann constant - luminosity of a star as a blackbody
- Colour-colour diagrams
- Vega as a blackbody
- Bolometric magnitude from flux
- Colour indices in terms of blackbody radiation rate
- Shaula (Lambda Scorpii)

- Lorentz transformations - derivation from symmetry
- Lorentz transformations and causality
- The light clock and time dilation
- Length contraction and time dilation - a few examples
- Another trip to Alpha Centauri - more Lorentz transformation examples
- Relativistic acceleration in terms of force
- Acceleration under a constant force
- Relativistic energy revisited

- Barnard's star - distance and velocity
- Diffraction gratings in spectroscopy
- Photoelectric effect
- Compton scattering
- Compton wavelength
- Energy levels of hydrogen - Bohr's semi-classical derivation
- Gravitational hydrogen atom
- Hydrogen spectrum - Lyman, Balmer and Paschen series
- De Broglie waves
- Uncertainty principle - a couple of examples from astronomy
- Zeeman effect in stars
- Uncertainty principle - visualization with Fourier series

- Image in a refracting telescope
- Lensmaker's equation
- Magnification in an astronomical telescope
- Single slit diffraction
- Diffraction from a circular aperture - Rayleigh criterion
- Image size at the focal plane - the plate scale
- Radio astronomy - spectral flux density and telescope efficiency
- Radio interferometry
- Optical interferometry - the SIM PlanetQuest project
- Resolving two single slit light sources - graphical example

- Binary star orbits - relation of semimajor axes
- Binary stars - determining masses and the mass function
- Eclipsing binary stars
- Sirius binary star system
- Spectroscopic binary stars - Zeta Phe
- Spectroscopic, eclipsing binary stars - mass, radius and temperature
- YY Sagittarii - an eclipsing binary star
- Extrasolar planets - some detection methods
- Radial velocities of a binary system - computer model
- Apparent motion of a binary star - computer model
- YY Sgr - computer model of an eclipsing binary star
- Extrasolar planet detection with light curves - OGLE-TR-56b

- Maxwell-Boltzmann velocity distribution
- Boltzmann equation for energy levels in stellar atmospheres
- Saha equation for stellar atmospheres
- Saha equation - neutral hydrogen gas
- Ionization in a helium star
- Saha equation breaks down at the centre of the Sun
- Calcium in the solar atmosphere