mei 162012
 
Ancient Egyptian Astronomers Observed A Variable Star

  The study of the ‘Demon star’, Algol, made by a research group of the University of Helsinki, Finland, has received both scientific and public attention. The period of the brightness variation of this eclipsing binary star has been connected to good prognoses three millennia ago. Papyrus Museum, Cairo, Egypt. The oldest Egyptian calendar. The [continue reading]