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Robinson protects neither area nor angles, so its Tissot indicatrices change size and shape at once, but only moderately. On the equator they are slightly elongated vertically, about 6% taller and 6% narrower than the true circle. At 30°, in the middle part of the map, they look almost round, with 11% more area. At 60° they turn into flattened ovals, half as wide again as on the globe but roughly as tall, and their area grows by 46%.
Every ellipse in a row has the same area, because enlargement here depends on latitude alone. What sets them apart is shape. The curved meridians tilt the ellipses toward the edges of the map: at 60°, angles near the central meridian change by about 25°, while at 150° longitude they change by more than 50°. The poles are not points but lines about 53% as long as the equator, and that is where the horizontal stretching is greatest. Turn on the true-north field: near the central meridian the arrows point straight up, while toward the edges they lean, inward in the northern hemisphere and outward in the southern.
Drag Poland from its real place, near 52°N, to the equator and the outline shrinks by about a quarter. At 72° it becomes about 40% larger than now, and moved toward the edge of the map along the same latitude it keeps its area but leans visibly. The 1.5× area isocole runs near 62°, and the 2× line only appears at 75°. Greenland, centered near 72°N, has its area enlarged 1.8 times here, while Mercator enlarges it 10.5 times at that latitude.
The center of Greenland lies near 72°N. On the Robinson map its area is enlarged about 1.8 times relative to the least distorted place, while Mercator enlarges it 10.5 times at that latitude.
The errors are small and spread evenly. On the equator the Tissot ellipses are about 6% taller and 6% narrower than a circle. At 30° they look almost like circles with 11% more area, and at 60° their area is 46% larger.
On the equator the outline shrinks by roughly a quarter, and at 72°N it is about 40% larger than at home. Dragged sideways toward the edge at the same latitude it keeps its area but visibly skews.
No. The poles are lines about 53% as long as the equator, and that is where horizontal stretching is greatest. The curved meridians also tilt the ellipses toward the map edges.
