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    The Maths behind DSD
    From: Eamonn Sparling
    Date: 2017 Oct 8, 16:38 -0700

    I am new to Astro nav and I like to use pub. no. 229. I think I understand how and when to apply double second
    difference, I will probably never need to. My curiosity relates to understanding the concepts supporting DSD
    and what is he relationship between the DSD and the required (extra) increment value of Hc. This is not intuitive to me.
    I would like if the forum could explain this mechanism, or direct me to the maths behind this concept.

    Thank you, E.S. 

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