'Enyaach: "I", pronoun used optionally
'aatay: First-person of 'etay ('etaay), "is big" (mostly Tiipay).
We know the subject of this sentence is "I" and not "the sun" (also 'enyaa) because the verb is conjugated in first-person and not third ('enyaach 'etay "the sun is big").