This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 晑 is uncertain. It visually combines 日 (sun) and 向 (facing), but its original meaning and formation are unclear.
The sun 日 above 向 (facing) suggests facing the sun, but the kanji's meaning is unclear, so treat it as a shape to recognize.
For キョウ, imagine facing the sun and saying 'kyou' (today) as the sun rises: kyou -> キョウ.