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The star on this map is centered where the equator meets the prime meridian, in the Gulf of Guinea. The central disk holds the hemisphere between 90°W and 90°E, with Africa, Europe, the Atlantic, all of South America and the eastern part of North America. The North Pole lies on its top edge and the South Pole on its bottom edge. The other hemisphere, with the Pacific, East Asia and Australia, is cut into the five points of the star.
Inside the central disk, distances from the map's center are true, and only the crosswise direction stretches. You can measure the distance from the Gulf of Guinea to Warsaw, Rio de Janeiro or Cape Town with a ruler along the radius. The Tissot indicatrices show it too. Those on the equator at 30° longitude are almost circles, 5% wider. At 30° longitude and 60° latitude they are stretched by 25%. The ellipses at 90°W and 90°E sit on the rim of the disk and are elongated along it by 57%. In the points of the star the ellipses flatten and turn, and the two at 30°N and 150° longitude are crossed by the cut between two points.
Drag Poland, centered near 52°N and 19°E: its outline is enlarged by 17% and slightly stretched across the radius. Moved to the center of the map, it returns to its true size. Drag it east past 90°E and it enters a point of the star. Angles there typically change by about 30°, in places by more than 70°: Australia is skewed by 29° and Japan by 46°. Area, though, changes only moderately across the whole map, from roughly half to 1.6 times the value at the center.
Inside the central circle distances from the map center are true, because only the cross direction stretches. The distance from the Gulf of Guinea to Warsaw, Rio de Janeiro or Cape Town can be measured with a ruler along the radius.
The hemisphere between 90°W and 90°E, with Africa, Europe, the Atlantic, all of South America and eastern North America. The other hemisphere, with the Pacific, East Asia and Australia, is cut into five arms.
Poland, centered near 52°N and 19°E, is enlarged by 17% and slightly stretched across the radius. Moved to the center of the map it returns to its true size, and beyond 90°E it enters a star arm where angles change by about 30°.
Moderately: from roughly half to 1.6 times the value at the center. Angles fare worse: Australia is skewed by 29°, Japan by 46°, and in places in the arms by more than 70°.
