# meeus47a.frink

``` // This program reads coefficients for moon position from meeus47a.txt. // It is used to find moon longitude and distance. sumL = "   sumL = (" sumR = "   sumR = (" for line = lines["file:meeus47a.txt"] {    [D, M, MP, F, l, r] = split[%r/\t/, line]    M = eval[M]    coeffL = ""    coeffR = ""    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 (l != "0")            coeffL = "\$l E"         if (r != "0")            coeffR = "\$r E"       } else          if (abs[M] == 2)          {            if (l != "0")               coeffL = "\$l E^2"            if (r != "0")               coeffR = "\$r E^2"          }    } else          {             if (l != "0")                coeffL = l             if (r != "0")                coeffR = r          }    if (coeffL != "")       sumL = sumL + " + (\$coeffL) sin[\$arg]";    if (coeffR != "")       sumR = sumR + " + (\$coeffR) cos[\$arg]"; } sumL = sumL + ")" sumR = sumR + ")" println[sumL] println[] println[sumR] 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 "" } ```

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 18492 days, 22 hours, 37 minutes ago.