def load_rob_ephemeris(fname):
    """
    Use to grab the ephemeris points in one of Rob's simulation data files

    ***PARAMS***
        fname [string]: name (including path) of file containing ephemeris pts 

    ***RETURNS**
        Roblons [list of floats]: longitudes
        Roblats [list of floats]: latitudes 
        Robalts [list of floats]: altitudes

    * This function was written for parsing Rob Gillies' simulation's files. *

    """
    f = open(fname)
    Roblons = []
    Roblats = []
    Robalts = []
    for line in f:
        l = line.split()
        try:
            Roblons.append(float(l[1]))
            Roblats.append(float(l[2]))
            Robalts.append(float(l[3]))
        except:
            continue    
    return Roblons,Roblats,Robalts