This book reports the analyses of sixty-four-morning twilight data collected in eighteen countries in Europe from May to September 2021. We obtained the data through real-time recording of the live webcam available: location-wise, the collected data range is 41 degrees in latitude difference. The lowest is Puerto del Carmen (Spain), with its latitude of 29o, while the highest came from Tromso (Norway) at 70o. The aggregate value of the fajr birth...