The book "Astronomical Time Series" offers a comprehensive examination of the concepts and applications of time series in astronomy. It is based on the insights and discussions that took place during the international symposium at Tel Aviv University in 1996, celebrating the 25th anniversary of the Wise Observatory. The authors, Dan Maoz, Amiel Sternberg, and Elia M. Leibowitz, highlight the historical and cultural significance of astronomical time series, which are considered one of the oldest concepts in human civilization. The book addresses the fundamental effects of the day-night cycle and their influence on human understanding of the universe. It is aimed at professionals and enthusiasts interested in the analysis and interpretation of time series in astronomy.