Anchor Y (anchorY)
The Anchor Y property shifts the attachment point for self-placing nodes.
This property is relevant only if the Y property is set. It shifts the attachment point for self-placing nodes between the point nearest to the parent's coordinate system's origin (value=0.0) and the most remote point (value=1.0). For nodes that are placed by their parent, this attribute has no effect. A value of 0.5, for example, sets the attachment point to the center of the node.
Type: Numeric.
The value must be a number in the range 0 to 1.
Default value: 0.
You can find the Anchor Y property in the Geometry category of the Properties view.