Astrology Spotting: Hong Kong

A couple of days ago, I visited Chi Lin Nunnery and Nan Lian Garden in Kowloon, Hong Kong (www.nanliangarden.org).  Just as I was about to leave, I came across a monument called 'The Light of Enlightenment'.  

I was more interested in the sundial at the base so I took a closer look:

Unfortunately, I couldn't make any sense of the sundial at all

So I moved onto the next panel:

Can you spot the dragonflies?  I couldn't tell if they were part of the clock until one flew away!  My sister commented on the symbols, saying they look astrological, but I told her they're not and I wouldn't expect to see astrology glyphs at a Buddhist garden...how wrong I was!

As you can imagine, I was totally gobsmacked when I saw this:

I don't really understand how the sundial on the right works...

I also found the phases of the moon on another panel:

Here's a map showing the location of Hong Kong in relation to China: