I've made my own words for left and right using the image of the sun and shadows.

In Gaja we can see that shadows moves in one direction. We can call this direction sunwise. We can call the other other direction counter. So in fern to determine whether what is sunwise and counter, we have to know a little bit about the sun.

In this image, we can say that the hitten, that which is being hit, will always see their shadow move sunwise. The opposite direction would be counter.