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Add fe-map and iss sources, The Shape of Distance as published, contribution guide

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- femap/: planar best-effort solver, build, result and page (fe-map.aethercosmology.com)
- satellites/: The Sync Test build, ISS elements, SatNOGS timings and page (iss.aethercosmology.com)
- src/handoff/The_Shape_of_Distance_PRESENTATION.html: inputs for both
- CONTRIBUTING.md; README and LICENSE-DATA cover all four sites; GitHub mirror for issues and pull requests

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Toby
2026-10-30 18:42:34 -04:00
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README.md
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# Cable Latency Survey
Measured round-trip times between cities, compared with the minimum
propagation time along submarine-cable routes on four models of the Earth's
surface: a sphere, a North-pole azimuthal equidistant (AE) map, an AE map
centred on 0°N 0°E ("dual-pole"), and a flat Mercator map. A round-trip time
below the fibre propagation floor along a model's route is inconsistent with
that model.
Measurements, code and data behind four sites:
| Site | Contents | Source |
|---|---|---|
| https://pingstats.aethercosmology.com | Measured round-trip times between cities, compared with the minimum propagation time along submarine-cable routes on a sphere, a North-pole azimuthal equidistant (AE) map, an AE map centred on 0°N 0°E ("dual-pole") and a flat Mercator map | `src/` |
| https://fe-map.aethercosmology.com | The best layout of 219 cities on a plane that a solver can find from timed flights, pings, rail and road lengths and satellite passes, and the same solve released into 3D | `femap/` |
| https://iss.aethercosmology.com | The Sync Test: the ISS at its published-orbit position on the globe and three flat maps, with a spoofed radio signal moving at the speed measured by SatNOGS stations | `satellites/` |
| https://distance.aethercosmology.com | The Shape of Distance: flights, triangles and satellite recordings | `src/handoff/The_Shape_of_Distance_PRESENTATION.html` |
- Report: https://pingstats.aethercosmology.com (also `cable_latency_survey_report.html`, a single file that works offline)
- Code: MIT (`LICENSE`). Measurements and derived data: CC BY 4.0, with third-party terms (`LICENSE-DATA.md`).
- Corrections, new measurements and re-analyses: `CONTRIBUTING.md`. Issues and pull requests on the GitHub mirror, https://github.com/aetherbird/cable-latency-survey.
## Files
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| `cable_latency_survey_data.json` | v1: the same measurements without coordinates. Kept for reference. |
| `cable_latency_survey_report.html` | The report, identical to the website. |
| `src/` | Pipeline code, raw logs and derived data (below). |
| `tests/` | Headless-browser checks of the report (`tests/run.sh`). |
| `femap/` | fe-map: solver (`fit.py`), build (`build.py`, `template.html`), result (`data/femap.json`), page (`site/`). |
| `satellites/` | iss: build (`build.py`, `template.html`), orbital elements and SatNOGS timings (`data/`), page (`site/`). |
| `src/handoff/The_Shape_of_Distance_PRESENTATION.html` | The Shape of Distance as published; the flights, limits and triangles used by `femap/` and the SatNOGS timings used by `satellites/` are read from it. |
| `tests/` | Headless-browser checks of the sites (`tests/run.sh`). |
### Raw measurements