This ornament has been sitting in our garden for some time. It ended up in an area where flowers had grown all over it and it just disappeared. We were doing some weeding and it re-emerged. I’ve just discovered that it’s called an armillary sphere sundial. According to Wikipedia a real armillary sphere is much more complicated:

An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (in the celestial sphere), consisting of a spherical framework of rings, centred on Earth, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic. As such, it differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations.

Apparently what we have is a sundial vaguely in the shape of a armillary sphere. It’s supposed to be mounted on a plinth and is often surrounded with thyme – get it??