Guide:
Eastern Eastmarch, northeast of Logging Camp Wayshrine.
Located in the ruins of Mzulft. You can reach ruins either by going directly southwest of Logging Camp Wayshrine or, if you are in the Jorunn’s Stand encampment, exit through the northern gate and head north. Either way, you will reach the ruins pretty fast. The skyshard is above the entrance and the snow-covered path leading to it is before the entrance, on the right between two stone pillars.