The world can be divided into two hemispheres in several ways, Eastern-Western and Northern-Southern being the most well known. But the next best known is the somewhat hazy Land Hemisphere vs the Water or Sea Hemisphere.

When adjusted just right, the great circle boundary between these hemispheres divides the earth between a hemisphere that has 80% of the earth's land and a hemisphere that has only the remaining 20% of the earth's land.

Of course on a temporary basis there's a daylit hemisphere and a hemisphere that's in night (or at least twilight, with the sun down but near the horizon).

At what time on what day of the year, is the daylit portion of the earth most nearly coincident with the land hemisphere?

Posted by Steven Lord on 2023-06-08 12:53:14