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The 'land hemisphere' if it contained exactly 7/8 of the land surface (87.5%) works out to 51% land. (130 000 000 km2) But the included comment is that it is still more than 50% water, which suggests that it is closer to 85% of the total land than 87.5%. — Preceding unsigned comment added by 22.214.171.124 (talk) 13:46, 28 May 2014 (UTC)
I believe it's a rounding issue, the figures of eighths are only approximate (the text actually says "just under seven-eighths"). Would need to check source to be sure, but I reckon very few people will be able to access the full text of that paper for free.--LukeSurltc 14:57, 28 May 2014 (UTC)