hi shootin
As you probably know by now, i am a firm believer in practising basics and keeping things simple.

Spine angle can be defined by the angle that the spine and the ground create. The spine angle is created when we bend from the hips to take our stance. Once we have taken our stance we want to maintain this spine angle for most of our swing. At this point we can think of the spine as the axis or the pivot point for turning our shoulders.
Another image you can use is imagine your spine and shoulder create a t-square. While maintaining the angle between the spine and the ground begin to turn your shoulders. Your shoulders should pivot around your spine, done correctly the line created by your shoulder will point to the ground. Turn your shoulders so your chest faces the target, the line created by your shoulders should point along the same line as when your chest faced away form the target.
To illustrate this better, take your stance and place a golf club across your shoulders. Turn your shoulders so your chest faces away form the target. Here you can see the shaft's end point towards the ground. Now take note to where the shaft is pointing. Turn your shoulders so your chest is facing the target. At this point your spine angle should remain the same as at address. Also the shaft's end should point along the same line as before.
If during the golf swing we stand up, the spine angle becomes more vertical and this causes the golf club to come outside the target line. Normally if a golfer stands up during the swing it occurs in the backswing. In order to make contact with the ball the club must travel from outside the target line to inside the target line through impact. This outside to inside swing path creates a steep plane angle and causes fat shots, pulled shots, severe slice (open club face), smother hooks (closed club face).

regards .......terry

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