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I don't think that's confusing anyone. Greenland appears to span 5 (hour-wide) timezones, because it does, and NY and LA are almost as far apart and span four (almost 5). This is exactly what you'd want to see in a map about the widths of timezones.

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But Greenland is 1000km wide at its widest (east-west), which is 1/4 the distance from NY to LA.

We're talking about timezones. The whole article is about timezones. The map has no purpose except to show timezones. I cannot emphasize enough the point that timezones are the relevant unit of measurement in this article.

I think the point is that although it's only 1000km, the difference when expressed as a proportion of one day is the same. So noon in LA corresponds to late afternoon in NY, noon on Greenland's west coast corresponds to late afternoon on Greenland's east coast.

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