<P> The first, and simpler, meaning relates to the reddish color a totally eclipsed Moon takes on to observers on Earth . As sunlight penetrates the atmosphere of Earth, the gaseous layer filters and refracts the rays in such a way that the green to violet wavelengths on the visible spectrum scatter more strongly than the red, thus giving the Moon a reddish cast . </P> <P> The second meaning of "blood moon" has been derived from this apparent coloration by two fundamentalist Christian pastors, Mark Blitz and John Hagee . They claimed that the 2014--15 "lunar tetrad" of four lunar eclipses coinciding with the feasts of Passover and Tabernacles matched the "moon turning to blood" described in the Book of Joel of the Hebrew Bible . This tetrad was claimed to herald the Second Coming of Christ and the Rapture as described in the Book of Revelations on the date of the first of the eclipses in this sequence on April 15, 2014 . </P> <P> At least two lunar eclipses and as many as five occur every year, although total lunar eclipses are significantly less common . If the date and time of an eclipse is known, the occurrences of upcoming eclipses are predictable using an eclipse cycle, like the saros . </P> <P> Eclipses occur only during an eclipse season, when the Sun appears to pass near either node of the Moon's orbit . </P>

When does the moon turn red what time