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A cardinal cross is an astronomical configuration where more than several planets are at 90 degrees apart from one another, and 180 degrees in opposition.
Saturn will be opposite Jupiter and Uranus, Pluto will be between them, 90 degrees away from each end. When the Sun and the closer in planets move to form hard angles to the former, a “cross” is formed.
This one happens when the outer planets are in “cardinal” signs. These are Aries, Cancer, Libra, and Capricorn.