Four blood moons are only mans theory by that of Mark Blitz and marketed by John Hagee. The four blood moons Mark spoke of never came close to any of the Jewish events he mentioned. There is no place in scripture where it describes four blood moons, but only mentions one blood moon before that great and terrible day of the Lord. Rev 6:12 says a great earthquake will happen first which will cause the sun to turn black as sackcloth of hair and then the blood moon will appear. This happens at the sixth seal, which none of the seals have been opened yet.
Joel 2:30 And I will shew wonders in the heavens and in the earth, blood, and fire, and pillars of smoke.
Joel 2:31 The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD come.
Act 2:19 And I will shew wonders in heaven above, and signs in the earth beneath; blood, and fire, and vapour of smoke:
Act 2:20 The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:
Rev 6:12 And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood;
Rev 6:13 And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind.
Rev 6:14 And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places.
Rev 6:15 And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains;
Rev 6:16 And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb:
Rev 6:17 For the great day of his wrath is come; and who shall be able to stand?