Star-X bibliography and source provenance

Documentation index · Geometric context · Implementation notes

This bibliography separates the Star-X arrangement from the inherited Cahill-Keyes geometry, historical octahedral material, and repository test artifacts. Web resources were last checked on 2026-08-01.

Direct Star-X sources

1. De Kosnik, Benjamin. “Cahill Keyes Star-X.” sunglint, 2022-06-27. Project description and plate diagram.

   This is the primary arrangement source. It describes cutting the four horizontal Cahill-Keyes sections into two groups, keeping the first two below, rotating the third and fourth sections above them around the North Pole, and using a 4 3 / 1 2 plate order. It also records four 17-by-22 portrait components and the resulting 34-by-44 carrier.

2. De Kosnik, Benjamin. “Star-X Internet Maps.” Portfolio entry, 2022–ongoing. Project overview.

   This identifies Star-X as a vertically compact, North-Pole-centered redesign of the Cahill-Keyes Butterfly M map and records its rotational, tiling, and internet-geography context.

3. De Kosnik, Benjamin. Historical Star-X rendered composition, 2024. Repository image.

   The image is used to illustrate orientation and visual context. Its data overlays, crops, and page decoration are not numeric projection inputs.

Inherited Cahill-Keyes implementation

1. Graça, Mary Jo, and Gene Keyes. “MegamapMaker-prep9.” Perl source, 2012-03-15, with later notes dated 2013-11-28. Repository copy.

   This is the direct source of the half-octant A–L formulas, preliminary scaffold, geographic normalization, and ordinary M-layout used by both C++ projections. Its header contains the applicable attribution, non-commercial-use, modification, redistribution, and commercial-contact terms.

2. cartofreako contributors. Native C++20 Cahill-Keyes forward projection. cart0freak0-cahill-keyes.h.

   Star-X calls this implementation directly. It is the numerical authority for local face geometry and the source M-layout; Star-X adds the group rearrangement, uniform page scale, and polar-composition helpers.

3. cartofreako contributors. Cahill-Keyes implementation notes and source map. Implementation documentation.

   This gives the formulas, constants, scaling proof, raster registration, test provenance, and licensing detail intentionally not duplicated in the Star-X notes.

Octant numbering and geometric specifications

1. Keyes, Gene. “Around the World in 8 Easy Pieces: The Cahill-Keyes 1-Degree Globe.” 2013-09-19. All eight octants and polar assemblies.

   The page labels individual octants and shows the four-octant North- and South-Pole assemblies. It is the visual reference for distinguishing official geographic octant numbers from left-to-right M-layout slots.

2. Keyes, Gene. “Cahill-Keyes Megamap Principles & Specifications.” CKOG principles.

   This specifies the 10,000-unit octant scaffold, mirrored half-octants, meridian regimes, polar spacing, equisection, and supple zones inherited by Star-X.

3. Keyes, Gene. “Cahill-Keyes Octant Graticule and Grid.” 2011-01-12. Construction illustrations.

   The diagrams connect longitude/latitude input, reference half-octant geometry, and final eight-face assembly.

4. Keyes, Gene. “Ongoing Development of the Cahill-Keyes Multi-Scale Megamap: Papers and Prototypes, 1973–2014.” Updated 2014-09-21. Development index.

5. Keyes, Gene. “Zooming to Crimea in the Cahill-Keyes Multi-Scale Megamap, Beta-2.” 2014-03-11. Beta-2 demonstration.

These two sources document the wider design history and scale-independent vector-map intent of the inherited projection.

Historical octahedral background

1. Cahill, Bernard J.S. “An Account of a New Land Map of the World.” Scottish Geographical Magazine, September 1909, pp. 449–469.

2. Cahill, Bernard J.S. “Map of the World.” U.S. Patent 1,054,276. Filed 1912-03-05; issued 1913-02-25. Patent text and drawings.

3. Cahill, Bernard J.S. “A Land Map of the World on a New Projection.” Journal of the Association of Engineering Societies, October 1913, pp. 153–207.

These establish the octahedral and Butterfly background. Star-X uses the later Cahill-Keyes geometry and De Kosnik arrangement; it is not a direct implementation of Cahill’s 1909 graticule.

Registration and repository verification

1. Visionscarto. “Cahill-Keyes 44 × 22.” SVG map asset, 2018. Repository SVG.

This is the registration family whose one-degree longitude adjustment is shared by the Cahill-Keyes and Star-X public APIs.

1. cartofreako contributors. Star-X public API verification. test-star-x-projection-api.cc.

2. cartofreako contributors. Perl-derived Cahill-Keyes API anchors. test-cahill-keyes-projection-api.cc.

3. alpha60 contributors. Geographic integration anchors. augment_carto_geo_specific.

The Star-X reference points apply its documented rigid transform and centered page scale to item 17. The test also compares both public projections across a separate global grid and checks every item 18 location.

1. De Kosnik, Benjamin. “Geometry Star-X 34 × 44 with poles.” SVG concept drawing, 2026. Repository reference.

   This illustrates the requested 120-percent page-centered scale, central star, and unified Antarctic presentation. Its Antarctica silhouette is intentionally not a scale or placement reference; the implementation uses the documented projection-relative radius, fixed 60°S boundary, and projection-only lower-clearance registration instead.

2. Natural Earth. “1:10m Physical Vectors.” Dataset page.

   GDAL clips these physical source layers at the projection’s fixed 60°S boundary. Natural Earth supplies geographic content only: it does not select the cutoff, radius, bearing, pole position, or lower clearance. The same cap can therefore be registered and drawn as a graticule without the dataset.

Source-to-implementation map

Documentation index · Geometric context · Implementation notes