Round the world trip
I’m back in Brisbane after a month of round-the-world travelling. I visited 4 continents, touched ground in 9 countries (including airport visits), flew 39,725 kilometres, gave 2 research talks, burned through too many tons of CO2 (sadly — soon to be offset, at least), and most importantly saw lots of friends and family. I’ll write more about the individual stops in the coming weeks. For now, it’s good to be back in Australia where it’s warm (but not humid, thanks Singapore!), and it’s time to do some work!
Comment by James Birkett
This makes me think, as long as you don’t visit either pole, your world-line have a well defined winding number around the earth’s axis. I think mine is 0, since I believe (though should have checked) that each flight I have taken has never crossed the Atlantic. Which way did you fly? Is your winding number positive or negative?
This reminds me of my frequent worry about entering and leaving buildings via different doors. The world’s walkable surfaces have a fundamental group and my world-line is definitely not representing the identity element. If someone pulled it tight through time I’d get badly injured.