Eadu

Eadu is a rain-lashed Outer Rim world of black crags and permanent storm cells, chosen by the Empire for exactly that misery: its kyber refinement laboratory - where Galen Erso and his conscripted science team converted Jedha's crystals into the Death Star's superlaser fuel - could work in isolation, hidden under weather that grounded most surveillance.

In 0 BBY Cassian Andor was ordered to assassinate Galen here; instead an Alliance bombing raid killed him in his daughter Jyn's arms on the landing platform - hardening her resolve to finish what her father's sabotage ('the flaw in the exhaust port') had begun.