Speedy Sunset ?

Discussion in 'Off-Topic Discussion' started by HarryS, Oct 13, 2014.

  1. HarryS

    HarryS Eternally Optimistic Gardener

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    One for the GC " Sky at night " team , or anyone else who can help .................
    Just got back from a lovely late holiday in the Canaries . As you know the islands are subtropical at around 28°N . Most evenings we went to a bar around 7:30 to watch the sunset . What surprised us is as soon as the disc of the sun touched the harbour wall , it disappeared beneath it in around 2 minutes. i.e. the full diameter of the sun.
    Now I know that dawn and dusk happen very quickly on the equator , but why :scratch: At our northerly latitudes we get nice lazy sunsets.

    TIA
     
  2. Fat Controller

    Fat Controller 'Cuddly' Scottish Admin! Staff Member

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    Purely a wild guess, but is it something to do with the distance from the sun? As in, the equator is closer to the sun than we are, hence the time taken is less?
     
  3. pete

    pete Growing a bit of this and a bit of that....

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    I think its because the nearer to the equator you are, the faster you are spinning.
    In effect the poles are almost standing still.
     
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    • Phil A

      Phil A Guest

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      Yep, you'm charging around at 1,667 kph at the equator, like being on the outside of a roundabout as opposed to the hub [​IMG]
       
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      • pete

        pete Growing a bit of this and a bit of that....

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        When I was a school I seem to remember it was close to 1000mph, bearing in mind the world has a circumference of around 25 000 miles it comes out at roughly 24 hours in one day.
         
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          • HarryS

            HarryS Eternally Optimistic Gardener

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            Now I thought it might be that , the speed of the Earth as you approach the equator . Just seemed a bit to basic . Well that's another mystery of the universe solved ! Thanks all :dbgrtmb:
             
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            • Phil A

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              "He was aproaching 70, but didn't apear to be speeding." (Spike M.)
               
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              • ARMANDII

                ARMANDII Low Flying Administrator Staff Member

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                . Yes, it does change from day to night, and vice versa, faster near the equator (actually in the Torrid Zone between the Tropics of Cancer and Capricorn). The reason is at those latitudes, the sunlight passes through less of earth's atmosphere than at high latitudes. The angle of the sun's descent toward the horizon is closer to the perpendicular, and for those two reasons, (a) the sun's light is refracted less at lower latitude, and (b) the sun "plunges" below the horizon at a steeper angle, therefore it gets dark quicker.
                 
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                • Trunky

                  Trunky ...who nose about gardening

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                  I think it's probably a result of the angle at which the sun drops below the horizon at sunset Harry.

                  In tropical latitudes, the sun is very high in the sky during the middle part of the day, actually being directly overhead at certain times of the year. On such occasions because the sun is a apparently descending from such a high position, it would appear to drop vertically below the horizon at sunset. This would cause darkness to fall more quickly.

                  In higher latitudes such as ours, the sun does not reach such a high position in the sky, so at sunset it will descend at a more oblique angle than it would in tropical latitudes, meaning that it takes longer to fall below the horizon and therefore darkness falls more slowly.

                  Edit: Armandii beat me to it. :doh:
                   
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                  • ARMANDII

                    ARMANDII Low Flying Administrator Staff Member

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                    :lunapic 130165696578242 5:
                     
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