By Seth Johnson
It was back in 1967 when there were four blood moons on Jewish feast days, and the nation of Israel fought the Six-Day War, recapturing Jerusalem.
Two decades before that, there were four blood moons on feast days, just after Israel was reborn as a nation after some 2,000 years.
The same phenomenon occurred shortly after Spain expelled the Jews in 1492.
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So it's no wonder that people who watch the signs in the heavens are expecting something to happen soon as four blood moons occur on feast days in 2014 and 2015.
The Bible affirms God uses the sun, moon and stars for signs and seasons. It records that a star led the wise men to Jesus after his birth, and the sun stood still as Joshua led Israel to victory in battle.
Last spring, and just a few weeks ago again, millions stared in awe at the night sky as blood moons appeared on two feast days.
Pastor Mark Biltz, the author of "Blood Moons," the inspiration for a documentary movie of the same name, sees a connection between what is happening in today's world and the "signs in the sun, moon and stars."
"God is offering, through these astronomical signs, an invitation to get on his calendar," he said.
Though the last two of the four rare blood moons -- appearing on the biblical holidays of Passover and the Feast of Tabernacles, or Sukkot -- will not happen until April and September of 2015, interest in the heavenly signs is not waning.
Biltz's book and documentary, released March 18, both have been consistently one of the top sellers in their categories on Amazon.com, and the break between the appearances of the last blood moon and the one upcoming April 4 is only encouraging interest in what Biltz calls "one of the most momentous messages from God we’ll ever see."
The "Blood Moons" documentary, directed by George Escobar, has been one of Amazon.com's top selling Faith and Spirituality movies of the year.
"I'm excited people are not only continuing to educate themselves about these heavenly signs, but that interest is only, in lunar speak, waxing," said Biltz.
April 15 marked the start of an extraordinary chain of events in the heavens, which happened to fall on Passover. Even though these lunar events will not happen again until 2015, there is great interest in what they could mean for humanity as the moons align with the unfolding of biblical prophecy. The second one in 2014 was Oct. 8.
"We are on the verge of witnessing something historic," said Biltz, who discovered the blood moons phenomenon in 2007.
What began on Passover is called a "blood moon tetrad," a series of eclipses in which the earth comes between the sun and moon. The blood references the reddish color of the moon as the sun's rays pass through earth's atmosphere.
In 2015, the blood moons are on April 4 and Sept. 28.
Biltz, founder of El Shaddai Ministries, is a well-known commentator on the feasts of the Lord who has spoken in Sweden, Germany, Switzerland, Canada and throughout the United States.
TV host Jim Bakker called Biltz' work "the most important book of the times."