“Four Blood Moons: Something Is About to Change” is a work of Biblical Studies and religious prophecy by John Hagee, utilizing the study of astronomy and the Bible in coordination with one another. In “Four Blood Moons”, Hagee argues that God is sending Jews, Christians, and the world messages through signs in the heavens. He presents a host of Biblical evidence demonstrating not only God’s support for the nation of Israel, but also evidence which demonstrates God has sent messages to mankind through astronomical events. One such series of events relates directly to the most recent Tetrad, or four series of four consecutive lunar eclipses, in which the moon turns blood red. Each such series of four consecutive moons directly coincides with seminal events in Jewish history. For example, the 1949-1950 Tetrad follows the creation of the modern State of Israel, and the succeeding war in which several Arab states fail in their quest to destroy Israel; and the 1967-1968 Tetrad coincides with the Six-Day War, in which Israel is again targeted by numerous enemies, ultimately ending with the reuniting of Jerusalem to Israel, proper. Hagee demonstrates that the next Tetrad will occur beginning in 2014, and that God is again sending the world a message in relation to Israel. Hagee explains that Christians and Americans must always stand united with Israel, and must watch for signs from God.