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ininewcrow ,
@ininewcrow@lemmy.ca avatar

There was a conversation I read a while ago that showed how a sailboat could travel a straight line over water from Halifax, Nova Scotia in Canada, travel southeast and end up on the west coast of British Columbia.

Basically sailing from the east coast of Canada to the west coast of Canada in a straight line.

ChaoticNeutralCzech ,

The line was published by David Cooke in this YouTube video. It lies on a plane but is not quite a great circle (in practice, you’d be turning slightly) and good luck sailing over the Antarctic ice shelfs this decade.

MossyFeathers ,

deleted_by_author

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    Varven OP ,
    @Varven@lemmy.world avatar

    Because going in that route would make it touch land which in the twitter post it says straight line without touching land

    essell ,

    I’ve always thought Australia was a trouble maker.

    MossyFeathers ,

    deleted_by_author

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    supamanc ,

    India. You would have to set off somewhat perpendicular to the Indian coastline to be perfectly straight.

    ironhydroxide ,

    For some reason I don’t think this is true.

    A straight line connecting two things does not necessarily have to connect to said things perpendicular to their border.

    ChaoticNeutralCzech , (edited )

    Not to mention, India’s coastline is very much not straight on a local scale. You’re bound to find a place where it turns perpendicular to the journey close to the theoretical starting point anyway.

    supamanc ,

    Yeah but, I’m talking about this particular case, not making a mathematical rule. You have to move away from the coast, and then cannot turn, so you have to head towards Africa. You can’t set off toward Australia. Although I hadn’t considered that you can just move the starting point. So, there’s that.

    Bassman1805 ,

    Alaska, Canada, Russia, a few on the -stans.

    This is the longest straight-line all-water route on earth.

    bstix ,

    The picture was about sailing the longest direct line.

    It’s not the longest anyway, but that’s what it was about. Technically one could sail infinitely many times around Antarctica in a straight line.

    ChaoticNeutralCzech , (edited )

    around Antarctica in a straight line

    No, that’s not Earth’s great circle, you’ll be turning slightly. It only seems straight on most map projections because they want latitudes to be horizontal.

    bstix ,

    Well, I stand corrected. I guess we’ll need to wait for the ice on the North pole to melt before we can make a more stupid voyage.

    lolcatnip ,

    It would, however, seem like a straight line to whoever was on the boat, because they’d be traveling due west the whole time, and the course corrections they’d have to make to keep going west would look the same as course corrections needed to account for wind, ocean currents, etc.

    ChaoticNeutralCzech ,

    I know but you need to be the right amount of pedantic. Too little and any sufficiently large curve seems straight, too much and you point out that there is no straight line on the surface of a sphere.

    Viking_Hippie ,

    deleted_by_author

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    Balthazar ,
    @Balthazar@sopuli.xyz avatar

    To clarify, as youve not understood the joke, nor read the comments. As far as I understand it, were you to start sailing at the first point, you never have to turn to arrive at the second. That’s why it’s “straight”. On the 2d plane you are completely correct however.

    For proper and better informed explanations read the other comments :D

    Thcdenton ,

    Hey that’s neat pulled it up in a 3d globe web app and its pretty close to straight

    dumbass ,
    @dumbass@leminal.space avatar

    I dont know much about straight lines, but he sure does look happy.

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