The globe under the Sun of now or of a post, with borders and country names

The Sun lights the globe where it really is (wwwroot/js/sun.js, the Astronomical Almanac's low-precision solar
coordinates): the day map shaded by the Sun's height and the Earth–Sun distance, warm city lights on the night side,
and a twilight blend about 13° wide between them. It shows now, refreshed every 30 s, or the moment of the hovered,
focused or pinned post: a click on a card pins it, and the subsolar point travels there the shorter way round. The
panel's top corner shows that moment, the phase of the day and solar time at the post's place, and the season in its
hemisphere (or in both, for a post without a place). Its tooltip shows the subsolar point, declination, axial tilt,
distance, irradiance, day length and the next equinox or solstice.

Land borders are thin paths. Country names are in the reader's language and appear as the camera comes closer:
largest countries first, away from the globe's edge, never overlapping. They come from world-atlas 2.0.2 (Natural
Earth 1:50m), prepared by tools/globe/prepare-countries.py, and are vendored with their hashes in SOURCES.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

CLAUDE.md

@@ -198,20 +198,31 @@ supplies:
   `GlobePanel`. Older pages load as the end comes near (`wwwroot/js/feed.js`); newer ones are polled every 45 s while
   the page is visible (PrivaPub has no streaming) and wait behind a "new" button.
 - **The globe** (`wwwroot/js/globe.js`, an ES module imported by `GlobePanel`) runs on globe.gl, vendored in
-  `wwwroot/vendor/globe/` with its textures (`SOURCES.md` has versions, licences and hashes; the service worker never
-  precaches it). It looks at the spherical mean of the located posts in view, pulses and draws an arc to a hovered
-  post, follows the theme (day/night texture), honours `prefers-reduced-motion`, and draws only while something moves
-  (idle, it costs no GPU time; `wake()` before anything that animates). Each pixel computes its own map coordinates
-  from its point on the sphere (`sharpen`), so the poles don't pinch; the map wraps horizontally and gets 8×
-  anisotropic filtering (`keepSharp`). The day texture is NASA's, its seam repaired by
-  `tools/globe/prepare-day-texture.py` (dev-only, needs Pillow). CDN-fronted
-  posts are labels per CDN on a ring at 68°N, never a place; hovering one draws its arc there and a ring where the server
-  was before the CDN. The posts'
-  places reach it in one call per feed change; cards are matched by `data-post-id`.
+  `wwwroot/vendor/globe/` with its textures and `countries.json` (`SOURCES.md` has versions, licences and hashes; the
+  service worker never precaches it). It looks at the spherical mean of the located posts in view, pulses and draws an
+  arc to a hovered post, honours `prefers-reduced-motion`, and draws only while something moves (idle, it costs no GPU
+  time; `wake()` before anything that animates).
+  - **Map.** Each pixel computes its own map coordinates from its point on the sphere (`sharpen`), so the poles don't
+    pinch; the maps wrap horizontally and get 8× anisotropic filtering (`keepSharp`). The day texture is NASA's, its
+    seam repaired by `tools/globe/prepare-day-texture.py` (dev-only, needs Pillow).
+  - **Sun.** `wwwroot/js/sun.js` (pure functions of a date: the subsolar point, Earth–Sun distance, seasons, a place's
+    elevation, phase of the day, solar time and day length) lights the globe in the shader: the day map shaded by the
+    Sun's height and distance, city lights on the night side, a twilight blend between. It shows now (refreshed every
+    30 s), or the moment of the hovered, focused or pinned post (`data-post-at` on the card; a click pins a card,
+    `data-globe-pinned`), and tells `GlobePanel` through `SunChanged`, which shows the moment, the phase and the season
+    in the panel's top corner. The theme changes only the atmosphere and the points.
+  - **Countries.** Land borders as thin paths, and names placed by `placeLabels`: largest countries first, once they
+    span enough pixels, away from the globe's edge and clear of each other, in the reader's language
+    (`Intl.DisplayNames`). `countries.json` is built by `tools/globe/prepare-countries.py` from world-atlas (Natural
+    Earth). The label renderer owns `display`, so labels hide through `visibility`.
+  - CDN-fronted posts are labels per CDN on a ring at 68°N, never a place; hovering one draws its arc there and a ring
+    where the server was before the CDN. The posts' places reach it in one call per feed change; cards are matched by
+    `data-post-id`.
 - **Nerd stats** (`Components/Nerd/NerdTip.razor`, rows from `NerdRow`): a post's ids, times and provenance (read on
   hover), its author and server with the server's changes of place and CDN week by week, its place or its CDN (how
-  PrivaPub found it, the place before it, the CDN's servers week by week), media and counts; the feed's paging and last request; the globe's camera,
-  points and frame rate.
+  PrivaPub found it, the place before it, the CDN's servers week by week), media and counts; the feed's paging and last
+  request; the globe's camera, points, countries and frame rate, and its Sun (subsolar point, distance, irradiance,
+  the place's elevation and day length, the next equinox or solstice).
 
 **Localization (`Services/CoalescingStringLocalizer.cs`).**
 - Lookup order: this repo's `Resources/AllStrings.resx` (+ `.it.resx`), then `FieldsNameResource`, then