The Australian flag - how to remember the star design

My Japanese friend bought this beach towel in Australia. Very handy for remembering the Australian flag.

Notice the Union Jack. It combines three flags, of England, Scotland and Wales.

Altogether six stars. One separate big star, a seven-point star. 

Four more, smaller, seven-point stars. 

One smaller five-point star.

Beautiful blue, red and white on this vibrant towel.