To snap a node of one object to a node in a second object…   The trick is to use the Node tool to do the move and snap. Also ensure that 'Snap to Object Geometry' is turned on. Select all the nodes of the shape you wish to move (you can use Ctrl + A to select all). Now drag the node that you want to snap.   Also note that there are snapping options in the Node & Pen Tools which affect those tools only, and are distinct from the more general snap