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From Pathfinder Adventure Path: Gatewalkers, which isn't enabled.

Astrolabe of the Falling Stars

ITEM 5
Price 50 gp
Usage held in 2 hands
Bulk L

This astrolabe is fashioned of magically attuned platinum plates and rings and is inset with carefully measured ruby gems. The astrolabe's back is engraved with helpful charts, a calendar, and a maker's mark.

An astrolabe of falling stars can be used as a Mariner's Astrolabe. In addition, it can produce the following magical effect.


Activate—Starfall (manipulate)
Frequency once per day
Effect With a flick of your finger, you set the astrolabe's rule spinning, causing the inset rubies to become a blur. Choose a point within 100 feet. The astrolabe of falling stars calls down a brief rain of meteorites in a 10-foot burst centered on that point, dealing 1d8 bludgeoning plus 1d8 fire damage to creatures in the area (DC 19 basic Reflex save).

Activate—Calculate 1 minute (manipulate)

Astrolabes can be used for navigation in unfamiliar or featureless locations. To use an astrolabe, the holder must be trained in Survival. By spending 1 minute to measure the height of the stars and planets, a holder who knows the time and date can determine the latitude, and a holder who knows their latitude can determine the date and time. An astrolabe also grants a +1 item bonus to checks to identify celestial bodies.

Pathfinder Adventure Path: GatewalkersORC