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    Re: Navigation on other planets
    From: Paul Dolkas
    Date: 2014 Feb 22, 20:55 -0800

    Actually, every now & then they use the cameras to do a sextant shot of the sun/demos/phobos to update their position. The rover’s on-board inclinometer serves as the AH.



    Paul Dolkas


    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Brad Morris
    Sent: Saturday, February 22, 2014 5:36 PM
    To: paul@dolkas.net
    Subject: [NavList] Re: Navigation on other planets


    Hi Lu

    You are absolutely right.  The original question was how to navigate on an extra-solar planet.

    I think our first exemplar should be the Mars rovers.  They clearly don't use celestial or a GPS variant.  They navigate firstly by mark one eyeballs (binocular cameras if I'm not mistaken) and secondly by counting wheel revolutions and accounting for wheel slip.  So call it reckoning by track made good.  That's how vehicles navigate when not on the earth.  They look around, plan their course and check how they are doing visually.

    In fact, for millennia, humans navigated across terra firma by eyeball, reference to landmarks (waypoints) and maps.  It was only the featureless environment of the oceans that required celestial.  Without oceans, no celestial would be required.  Make it easier? Yes!  Required? No!


    On Feb 22, 2014 6:47 PM, "Lu Abel" <luabel{at}ymail.com> wrote:

    You're absolutely right, Brad.   As I recollect, though, the original question had to do how one might navigate once had landed on an extra-solar planet.



    From: Brad Morris <bradley.r.morris---.com>
    To: luabel{at}ymail.com
    Sent: Saturday, February 22, 2014 12:02 PM
    Subject: [NavList] Re: Navigation on other planets


    It would seem that inter-stellar travel would indeed take some form of celestial navigation.  The stars can be considered to be points within 3 space.  As you move among them, the perspective of them will change while the positions of the stars do not.  Your position in interstellar space is a function of finding the position that matches the perspective!

    It seems on the face of it to be a reasonable transform


    On Feb 22, 2014 2:47 PM, "Marcel Tschudin" <marcel.e.tschudin---.com> wrote:

    True, but the question was about navigating on planets outside our solar system.

    In this conversation also Jupiter and Saturn were mentioned ... I assumed that one ment those in this solar system.


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