宣

Top roof radical (Kangxi #40) — a hipped roof seen from the front, signaling that whatever follows happens inside a building. 宣 originally named the proclamation hall in the imperial palace, so the roof here is specifically the throne room. Same family: 家 home, 室 room, 安 peace-under-roof, 守 guard.

Bottom is 亘 — a sun rolling between two horizons, supplying the sound gèn → xuān through historical drift. Same phonetic shows up in 喧 noisy, 萱 day-lily, 暄 warm-sunny. Faint semantic flavor too: a royal proclamation 宣 was meant to spread from horizon to horizon, exactly the 'span across' image 亘 depicts.