Position of vertex

Is there a way to get absolute position of a vertex and setting the position of another numerically?

I want to position an icosphere on a table, with the lower point of the icosphere alligned with the table.

Snap your 3D Cursor to the bottom vert of the IcoSphere then move your Object Center to the Cursor, snap your cursor to the table (a vert again) and snap the IcoSphere to that. Or use the KlopUtils script in the Wizards menu.

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Done. Selected bottom vertex in icosphere and SHIFT-S

then move your Object Center to the Cursor
Clicked Mesh button in Editing Panel, labelled Centre Cursor
snap your cursor to the table (a vert again)
Selected a vertex in table and SHIFT-S
snap the IcoSphere to that
I’ve got no clue. Please elaborate.

snap the IcoSphere to that I’ve got no clue. Please elaborate.

In Object mode select the IcoSphere, Shft-S >> Selection to Cursor. Now your Object Center which is at the lowest part of the IcoSphere will snap to the Cursor which is at the vert on the table. You can now move your Object Center back to the center of the IcoSphere.

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Thanks. That did the trick.