Here’s more of the World Establishment materials from the FFIX Ultimania, translated by curiousACfan. Major thanks to him for bringing this info to light!!!
The relationship between the moons and the radiance of the crystals
Two moons
When Terra’s attempt at Fusion with Gaia failed, they partially melded, but there remained parts which did not. From that day on, Gaia’s original blue moon and Terra’s red moon both orbited around Gaia (for more details on Fusion, refer to P.40, “Gaia and Terra”).
The crystals and the two moons
The color each moon radiates is the true radiance of its planet, received from the light of each crystal. The color of Gaia’s crystal is blue and the color of Terra’s crystal is red, and their own moon shines with their radiance. [See Figure 4]
Therefore, because Terra’s crystal is inferior to Gaia’s and the moons travel in constant ellipses, the nature of the moons’ waxing and waning is such that, as Gaia’s moon draws closer to being in front of Terra’s, portions of Terra’s moon on the other side are covered in shadow. [See Figure 5]
As the two moons go around in orbit like in [Figure 6], every sixteen days, the positions of the blue and the red switch, and the two moons are stacked one in front of the other.
Only Gaia’s radiance is strong enough to be seen when its moon is directly in the back, as seen in [Figure 7].
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