An original adult observatory mechanic repairs an intricate brass star-tracking mount during the night shift. She has short dark hair, ochre utility coveralls, protective gloves and a small headlamp, leaning carefully over precise gears and adjustment rings. Set the scene inside an open mountain observatory dome with a large telescope silhouette, a workbench of lenses and mechanical tools, and a star-filled sky visible through the slit. Use a vertical 2:3 composition from a low three-quarter angle, with the telescope arc framing the upper scene. Balance cool moonlight and starlight with a warm task lamp. Polished original anime illustration, hand-painted background, crisp character design and subtle cel shading. Adult proportions, correct hands, coherent machinery, no school uniform, no fan service, no copyrighted character resemblance, no readable text, no logos, no watermark.