Complete authored sky colors and eclipses (#44)

README.md

@@ -124,14 +124,20 @@ the top or underside of one of its blocks. Insert a bound Linking or Descriptive
 Book to activate it; the book remains visible on the receptacle. A Linking Book aimed at its
 own dimension still opens a visual portal, but travel requires Intra Linking.
 
-Sky writing includes eight color pages and a Static Sky page. Multiple sky-color
-pages blend their colors, tinting the Age sky, book preview, and the fallback
-surface of portals linked there. Multiple celestial-color pages blend for the
-next written sun or moon. An Age may have no suns or moons at all;
-Static Sky animates the sky with television-like noise. Sun and Moon pages add
+Sky writing has shared Red, Green, Blue, White, and Black pages plus 25 D'ni
+number pages (0–24). Put colors before a Sky, Sun, or Moon page to color that
+target; trailing colors tint the sky. A number immediately before a color sets
+its strength to number × 10. Without a number, a color gets a seeded random
+strength from 0–24. RGB contributions add in any order, White brightens all
+channels, Black subtracts from all channels, and omitted channels remain zero.
+The resulting sky color also tints book previews and fallback portal surfaces.
+An Age may have no suns or moons at all; Static Sky animates with fine-grained
+television-like noise. Sun and Moon pages add
 independent bodies; preceding color, size, angle, period, phase, and direction
 pages configure the next body. The third and each subsequent sun add increasing
-instability. Newly generated page-free Ages also choose a deterministic sky,
+instability. Overlapping moon and sun discs produce an eclipse: the moon darkens,
+the sun's color brightens at close alignment, and world and sky lighting dim.
+Newly generated page-free Ages also choose a deterministic sky,
 color, and celestial arrangement from their Age seed; older saved Ages retain
 their previous sky.