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ISS Over Ireland

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    #62
    Carne
    Registered Users Posts: 245 ✭✭Carne


    What direction will it be going tonight?


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    #63
    Beeker
    Moderators, Science, Health & Environment Moderators Posts: 3,645 Mod ✭✭✭✭Beeker


    Last chance to see the ISS pass tonight for a few weeks.

    21:33 - 21:37

    viewfinder.exe?T=0&FOV=60&RA=127.803436070349&Dec=-15.3745757667497&RAInc=60&DecInc=10&TimeInc=15&SatName=ISS&Width=400&Height=400&STime=40666.8577479736&Lat=52.1113&Lng=-7.0513&Line1=1+25544U+98067A+++11122%2E84134635++%2E00046234++00000%2D0++31245%2D3+0++2890&Line2=2+25544+051%2E6483+033%2E6232+0002448+171%2E9184+298%2E3500+15%2E74575713713763


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    #64
    Bozacke
    Registered Users Posts: 301 ✭✭Bozacke


    Hi,

    Will the ISS be moving across the sky tonight from west to east??


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    #65
    Davaeo09
    Closed Accounts Posts: 1,220 ✭✭✭Davaeo09


    Will it be clearly visable?

    I'll be glued to the match on the telly around that time :(


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    #66
    Sad Professor
    Moderators, Category Moderators, Arts Moderators, Entertainment Moderators, Technology & Internet Moderators Posts: 22,676 CMod ✭✭✭✭Sad Professor


    Bozacke wrote: »
    Will the ISS be moving across the sky tonight from west to east??
    West to South, I think.
    Davaeo09 wrote: »
    Will it be clearly visable?
    Looks like another very low pass. Unless you have an unobscured view of the horizon you may not see it. I haven't been able to see it the last two nights. Too many trees, houses, etc in the way.


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    #67
    CO19
    Registered Users Posts: 690 ✭✭✭CO19


    Beeker wrote: »
    Last chance to see the ISS pass tonight for a few weeks.

    How come it isn't visible for a few weeks again ? is it that it changes its orbital path ? If so why does it do this as in why can't it just stay as it is now :confused:


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    #68
    Beeker
    Moderators, Science, Health & Environment Moderators Posts: 3,645 Mod ✭✭✭✭Beeker


    CO19 wrote: »
    How come it isn't visible for a few weeks again ? is it that it changes its orbital path ? If so why does it do this as in why can't it just stay as it is now :confused:
    No its orbital path continues along as normal like it does everyday. It takes the ISS about 91 minutes to complete one orbit. So imagine it starts its orbit directly over your head, 91 minutes later it has completed one orbit but it is not back overhead, why? Because the Earth has rotated to the east in that 91 minutes. The Earth rotates at about 1000mph at the equator which is about {ballpark figure} 600mph here. So in 91 minutes the point you are standing on will move 900 miles to the east. Therefore each ISS orbit crosses over a point 900 miles further west, thats why the times change each night. Over a number of weeks it means that the ISS will pass over Ireland during daylight hours and not be visible to us until it works its way back into nighttime passes once again.
    Hope that helps explain it.
    Note figures are aprox:)


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    #69
    peterako
    Registered Users Posts: 720 ✭✭✭peterako


    Jaw dropping image taken by Carl O'Beirnes at IFAS:

    normal_ISS-1-5-11-Finished-Labeled.jpg

    Go to the link below and you can see a massive version of Carl's image.

    Location of Carl's Pic

    WOW!!

    Clear skies!
    Peter


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    #70
    CO19
    Registered Users Posts: 690 ✭✭✭CO19


    Beeker wrote: »
    No its orbital path continues along as normal like it does everyday. It takes the ISS about 91 minutes to complete one orbit. So imagine it starts its orbit directly over your head, 91 minutes later it has completed one orbit but it is not back overhead, why? Because the Earth has rotated to the east in that 91 minutes. The Earth rotates at about 1000mph at the equator which is about {ballpark figure} 600mph here. So in 91 minutes the point you are standing on will move 900 miles to the east. Therefore each ISS orbit crosses over a point 900 miles further west, thats why the times change each night. Over a number of weeks it means that the ISS will pass over Ireland during daylight hours and not be visible to us until it works its way back into nighttime passes once again.
    Hope that helps explain it.
    Note figures are aprox:)

    Ah now I see :) thanks for that,we'd be lost without you here :D


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    #71
    WalterMitty
    Registered Users Posts: 1,582 ✭✭✭WalterMitty


    Beeker wrote: »
    No its orbital path continues along as normal like it does everyday. It takes the ISS about 91 minutes to complete one orbit. So imagine it starts its orbit directly over your head, 91 minutes later it has completed one orbit but it is not back overhead, why? Because the Earth has rotated to the east in that 91 minutes. The Earth rotates at about 1000mph at the equator which is about {ballpark figure} 600mph here. So in 91 minutes the point you are standing on will move 900 miles to the east. Therefore each ISS orbit crosses over a point 900 miles further west, thats why the times change each night. Over a number of weeks it means that the ISS will pass over Ireland during daylight hours and not be visible to us until it works its way back into nighttime passes once again.
    Hope that helps explain it.
    Note figures are aprox:)
    just OT for a sec, does time pass faster for the person at the equator travelling faster than in Ireland?


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    #72
    Beeker
    Moderators, Science, Health & Environment Moderators Posts: 3,645 Mod ✭✭✭✭Beeker


    WalterMitty wrote: »
    just OT for a sec, does time pass faster for the person at the equator travelling faster than in Ireland?
    If you travel faster then time slows down for you. So that means that a person at the equator would age slower but only very very very slightly. :eek:


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