https://images.nasa.gov/details/ARC-1935-A93-0075-6 URL: http://images-assets.nasa.gov/image/ARC-1935-A93-0075-6/ARC-1935-A93-0075-6~orig.jpg determination method...
https://images.nasa.gov/details/ARC-1935-A93-0075-9 URL: http://images-assets.nasa.gov/image/ARC-1935-A93-0075-9/ARC-1935-A93-0075-9~orig.jpg determination method...
