The Witch's Wheel isn't just a calendar.
It's a Great Rite.
Most would think of the Wheel, with its quarters and cross-quarters, as an image of the year.
In this sense, it is an icon of Time, sacred Time.
But of course the Wheel is also an icon of Space, sacred Space: the compass rose, with its eight directions, not to mention the magic circle.
So together it's an icon of Time-Space.