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Thread: Sunrise Summer Solstice, Sunrise Winter Solstice.

  1. #1 Sunrise Summer Solstice, Sunrise Winter Solstice. 
    The Enchanter westwind's Avatar
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    Degree of arc at horizon points. 6/7 days to Melbournes Winter Solstice. ( 21/22 June,2012. ), minimum daylight hours. Summer Solstice, 21/22 December 2012. Maximum daylight hours. I am not a Maths man, so I have tried to estimate the degree of arc, measured at my horizon view here in Melbourne Australia. I have estimated it to be approx. 47 degree between sunrise points, winter Solstice and Summer Solstice. Will some Member please advise me how to run a conformation or otherwise check on my estimate. Westwind.


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  3. #2  
    Comet Dust Collector Moderator
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    The math is pretty complicated, so I used SkyMap Pro, which has superb astronomical math included.

    Winter solstice sunrise is at 60 1/2 degrees azimuth and sunrise to sunset is 9:35 (HH:MM)

    Summer solstice is at 120 1/2 degrees azimuth and daylight hours are 14:45

    So there's a 60 degree azimuth difference between the solstices.


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    The Enchanter westwind's Avatar
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    Thanks MW. Larger arc then I thought. It's no wonder that I'm freezing to death down here, the winds are coming up from Antartica, they whip around the West Coast of Tasmania and straight into Melbourne. westwind.
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  5. #4  
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    The Earth's axial tilt = 23.45'
    therefore the degree of arc = 46.9'

    Simple maths, Happy Age of Aquarius ((* I'm nearly 47
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