amateurs'manuals astronomicalphotometry astronomy astrophysics blackholes(astronomy) celestialmechanics congresses cosmologicaldistances dataprocessing detection extrasolarplanets galaxies generalrelativity(physics) geodesy geodynamics hipparcos(artificialsatellite) history instruments interferometry interstellarmatter largeastronomicaltelescopes measurement methodology observations particleacceleration pulsars pulsatingstars radioastronomy research spaceastronomy technique transits variablestars verylongbaselineinterferometry womenastronomers