Been there, done that. The commonly accepted ruling is to take the time that the sun is at its lowest point as simultaneous sunset/nightfall/midnight/dawn/sunri

Been there, done that. The commonly accepted ruling is to take the time that the sun is at its lowest point as simultaneous sunset/nightfall/midnight/dawn/sunrise (each of which has its own significance in Jewish law). So shabbat is from around midnight Friday to midnight Saturday. It also means one can pray the afternoon, evening, and morning prayers one after the other.