Literary — almost never appears alone in modern Chinese. Lives in the fixed pair 翌日 (yìrì, 'the next day') and 翌年 (yìnián, 'the next year'), both common in news, novels, and historical texts. Modern colloquial equivalents: 第二天 / 第二年.
memory
羽 ('feather') below 立 ('to stand') — the original meaning was 'next day' (when feathers spread / sun rises again). Same root as 翼 (yì, 'wing').
