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Monday, July 7, 2008

puzzle

when you start out,

you are at home. it is tuesday.

you start walking on a tuesday at 12:00 noon, easterly, at a constant speed. thirty minutes later, after circumnavigating the globe (you walk really fast), you return. as you traveled, you kept asking people what day it was.

tuesday.

that was the reply for a while. but then, when it was near midnight by wherever you were walking (like tokyo), they started to reply

wednesday.

as you kept walking, you keep asking people what day it is.

what day is it when you get back home?

3 comments:

bazoo said...

tuesday, of course.

Too Tall Abe said...

i think the thing i was trying to get at (with the puzzle) was that if it's (obviously) tuesday when you get back, then where along the line of your run did it stop being wednesday? there needs to be an imaginary marker where everyone agrees the day changes. apparently, everyone else has already heard of the international date line. : P

bazoo said...

sure, sure. The dateline is just a biproduct of the idea that the solar / rotational significance of a particular time of day should be universal. That idea is good if the earth is flat, but it's not!

Time zones are just kludges based on the momentum of 'noon' meaning something about the sun in the sky.