I should think it idolatry to be focused on astrology.
Well God did create the sun and moon for a purpose, but their purpose was help people determine his holy days:
(GW) Then God said, "Let there be lights in the sky to separate the day from the night. They will be signs and will mark religious festivals, days, and years
But I think this prognostication based on "blood" moons is pretty far fetched. It's safe to say that the holy days of the Lord can and do herald significant events which of course is part of the reason for their creation.