Four Blood Moons

"...There will be signs in the sun, in the moon, and in the stars...Now when these things begin to happen, look up and lift up your heads, because your redemption draws near." Luke 21:25a, 28 It is rare that Scripture, science, and history align with each other, yet the last three series of Four Blood Moons have done exactly that. Are these the "signs" that God refers to in His Word? If they are, what do they mean? What is their prophetic significance?