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  • October 3, 2024 at 7:15 pm - Views: 27 #5621
    John PickeringJohn Pickering
    Participant

    Evening all,

    i built an equatorial sundial. Now I want to add a plaque with information about how to correct the time shown by the shadow to clock time (equation of time, latitude, daylight saving etc).  This needs to be for  Christchurch.  Does anyone know a good place to get the corrections from?

     

    Equatorial sundial

    October 3, 2024 at 7:32 pm - Views: 73 #5622
    Preetha SreedharanPreetha Sreedharan
    Participant

    Hello, cool sundial time lord!!

    Rob thinks that the plaque for the Botanical Gardens sundial is still there with the graph even though the sundial is no longer there… hope that helps.

    October 3, 2024 at 8:20 pm - Views: 65 #5623
    Terry RichardsonTerry Richardson
    Moderator

    Talk to Geoff Shaw (ICU)

    He makes corrected calibrated sundials and will know the math.

    Good luck. A worthy project

    Cheers

    Terry

    October 24, 2024 at 12:23 pm - Views: 57 #5663
    Orlon PettersonOrlon Petterson
    Keymaster

    Hi John

    The following PDF for the Southern Hemisphere Equation of Time is what you want to look at.

    https://www.sws.bom.gov.au/Category/Educational/The%20Sun%20and%20Solar%20Activity/General%20Info/EquationOfTime.pdf

    October 29, 2024 at 7:25 am - Views: 71 #5667
    John PickeringJohn Pickering
    Participant

    Thank you everyone.  I am going with a simple table like in the sundial in the botanical gardens (except I add the extra 30 mins for longitude). Will post pics when all finished.  In the meantime, there is a temporary notice and lots of people stopping to look and check their watched 🙂

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John Pickering