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Thread: has ever been used this method to claculate suns distance?

  1. #1 has ever been used this method to claculate suns distance? 
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    it has to be a day of half moon like today

    this means if the sun is an a very big distance distance sun and moon will be 90 apart

    now in the day of half moon you measure the angle between both and voila you know how much farther is the sun than the moon

    i just did it today i saw the sun and the moon and measure the angle aiming to both with both arms

    to my surprise it turn out the had an agle of aproximatly 70, certainly very far from 90

    can somebody explain this?

    if the angle is 70 it means the sun is 3 times farther than the moon





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  3. #2  
    Moderator Moderator Dishmaster's Avatar
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    How high above the horizon were sun and moon? Have you considered atmospheric refraction?

    How accurately can you confirm that the phase was half moon at that time?

    http://stardate.org/nightsky/almanac/

    Remember that the moon moves about 12 degrees per day around the earth. So, if you are half a day off, your estimate is already quite inaccurate.


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  4. #3  
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    it was 2 hours after half moon

    at 5 o clock noticed this

    edit:

    notice half moon is exactly today:

    http://stardate.org/nightsky/moon/

    here:

    http://www.astro.washington.edu/cour...nes/rung3.html

    now why did i get 70?
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  5. #4  
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    Atmospheric refraction is a biggie, along with the dirrection from half moon it was traveling, whether it was moving towards the sun or away, in terms of your perspective.
    Wise men speak because they have something to say; Fools, because they have to say something.
    -Plato

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  6. #5  
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    oh never mind i suppose calculating angles by eye is not valid and i already got my answer, its valid use moon shadows to calculate suns distance
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