Elongation

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  • #55819
    AvatarThomas F.
    • Topics: 32
    • Replies: 38
    • Posts: 70

    Hi,

    one short question: “Is there a way to calculate and especially to display the greatest western and eastern elongation for Mercury?”

    Thanks,

    Thomas

    #55827
    MathewMathew
    • Topics: 28
    • Replies: 1,229
    • Posts: 1,257

    Hi Thomas,

    There would have to be a way to do it in scripting, but it will involve a bit of geometry. I do see that the swiss ephemeris has it available but we have never exposed it and it would be a 3-6 month turn around for us to add it in. My whole astro engine overhaul has been delayed, but I can add this to that list.

    Elongation angle is the angle between planet and sun as seen from earth. Greater Western would look like this

    images

     

    So we can take Geocentric PVAL for Sun and Mercury then take the difference between them. We will have to smooth the results to deal with one of them being over 360 degrees etc.

    Here is a script to use

    This is the script for the arrows, but if we output “smooth” then you can see the plot at the bottom.

    I’m not sure that this is the right number but it will give you a start and hopefully it gives you what you need right now.

    All the best

    Mathew

    elong

    1 user thanked author for this post.
    #55831
    AvatarThomas F.
    • Topics: 32
    • Replies: 38
    • Posts: 70

    Hi Mathew,

    thank you really very much for your time and efforts to answer my question.

    I think I can wait 3-6 months until you have overhauled your astro engine and have added the elongation feature to your astro engine.

    Thanks,

    Thomas

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