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Mollweide preserves area, so each of the thirty Tissot indicatrices takes up the same space on the map. Their shape, however, depends on two things at once: latitude and distance from the central meridian. Only two points are entirely free of distortion, both on the prime meridian at about 40.7° north and south. The farther a circle lies from them, the more it stretches and leans.
On the equator all the ellipses look alike: about 11% taller and 10% narrower than the circle, with angles changed by 12° at most. Higher up, the differences within a row become clear. At 60°, the ellipse at 30° longitude changes angles by 26°, the one at 90° by 56°, and the one at 150° by as much as 81°. That last one is strongly skewed, its long axis almost five times its short axis. The poles are single points here, so the meridians crowd ever closer toward them.
Poland lies close to the best part of the map, and its angles change by 13° at most. Drag it east to the latitude of Kamchatka: the area stays the same, but the outline's longest dimension doubles and its shortest halves. New Zealand, far from the central meridian, is heavily distorted too. For comparing areas this map is reliable, but country shapes near the edge need careful reading.
The angular isocoles tell you the most here, and they form arcs. On the central meridian the 5° line encloses a belt from 32° to 48°, while at 150° longitude the 60° line already starts at 44°. The whole map is an ellipse exactly twice as wide as it is tall, and the 90°W and 90°E meridians together form a circle that holds exactly half of the Earth's surface.
Only two points are free of distortion, both on the prime meridian at about 40.7° north and south. The farther from them, the more the Tissot ellipses stretch and skew. Poland lies close and changes angles by 13° at most.
At 60° latitude the ellipse at 30° longitude changes angles by 26°, at 90° by 56° and at 150° by 81°. That last one has a long axis nearly five times its short axis. Area stays true throughout.
That proportion follows from how an equal-area projection is built. The meridians 90°W and 90°E together form a circle that holds exactly half of Earth's surface. The poles are single points here.
At the latitude of Kamchatka the area stays the same, but the longest dimension of the outline doubles and the shortest halves. Shapes near the edge need careful reading, though area comparisons stay reliable.
