... An astrolabe is my device of choice for aiming the mortar. First, I have to shift-right click on the targeted location with an astrolabe, and then right click on the mortar to calibrate it.
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The Astrolabe is a tool added by Flaxbeard's Steam Power. It is used to set the location of the Item Mortar's approximate landing spot. This can be done using the sneak+use key.