movement of the sun/moon through the heavens
躔 centers on the cyclical movement of celestial bodies, specifically the sun and moon, as they trace their paths across the sky.
躔 combines 足 (foot) with 廛, which likely contributes the sound and relates to a path or track. The character suggests the foot-like movement of celestial bodies along their courses.
The left side 足 (foot) steps across the sky, while the right side 廛 suggests a measured path. Picture the sun and moon walking their eternal routes through the heavens.
For テン, imagine the sun and moon moving through ten heavenly stations: ten -> テン, and each station marks a step in their journey.