meeus47b.frink

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// This program reads coefficients for moon position from meeus47b.txt.
// It is used to find moon longitude and distance.

sumB = "   sumB = ("

for line = lines["file:meeus47b.txt"]
{
   [D, M, MP, F, b] = split[%r/\t/, line]

   M = eval[M]

   coeffB = ""
   arg = fmt[D, "D"]

   arg = arg + fmt[M, "M"]
   arg = arg + fmt[MP, "MP"]
   arg = arg + fmt[F, "F"]

   if (M != 0)
   {
      if (abs[M] == 1)
      {
        if (b != "0")
           coeffB = "$b E"
      } else
         if (abs[M] == 2)
         {
           if (b != "0")
              coeffB = "$b E^2"
         }
   } else
         {
            if (b != "0")
               coeffB = b
         }

   if (coeffB != "")
      sumB = sumB + " + ($coeffB) sin[$arg]";
}

sumB = sumB + ")"

println[sumB]

fmt[x, char] := 
{
   x = eval[x]

   if (x == 1)
      return " + $char"

   if (x == -1)
      return " - $char"

   if x > 0
      return " + $x $char"

   if x < 0
      return " -" + (-x) + " $char"

   return ""
}


View or download meeus47b.frink in plain text format


This is a program written in the programming language Frink.
For more information, view the Frink Documentation or see More Sample Frink Programs.

Alan Eliasen was born 17841 days, 20 hours, 54 minutes ago.