public Color GetPixelAtRaDec(Vector2d raDec)
{
Vector2d vectord = default(Vector2d);
vectord.Y = yoff - (raDec.Y - decCenter) / scale;
vectord.X = xoff - (raDec.X - raCenter) * Math.Cos(raDec.Y * (Math.PI / 180.0)) / scale;
PixelData filteredPixel = fastImage.GetFilteredPixel(vectord.X, vectord.Y);
return(Color.FromArgb(filteredPixel.red, filteredPixel.green, filteredPixel.blue));
}