sharper earth map

readme.md

@@ -125,7 +125,10 @@ because most NASA models are Draco-compressed and are decoded on the way in.
 At lighting L1, Earth's surface comes from NASA's Blue Marble, which
 `scripts/fetch-earth.sh` downloads and resizes (with ImageMagick) into
 `data/earth/`, one image per month. The month comes from the scene's epoch, or
-from `[appearance] earth_month` in a scene without one. The Moon's surface
+from `[appearance] earth_month` in a scene without one. `scripts/fetch-earth.sh
+--sharp 07` also makes July's sharp map (460 m per texel instead of 2.45 km; 330 MB
+to download and about 3 minutes to make 4.9 GB), which the CLI and the movie use
+when it is there. The Moon's surface
 comes from the LRO Camera's normalized-reflectance mosaic, which
 `scripts/fetch-moon.py` downloads (1.2 GB) and assembles (with numpy and Pillow)
 into `data/moon/wac-hapke-643.png`. The Moon is turned by the scene's epoch, or