Marina offers to help Sol with her lesson on telling time. Tarde can be translated as either "afternoon" or "evening," depending upon the hour. Tarde encompasses a longer period of time from many English speakers' notions of "afternoon" or "evening." Note that Buenas noches" [literally "Good night"] may be used when many English speakers might use "Good evening" to greet someone at a later hour, whereas "Good night" in English tends to be used mainly at bedtime or to say goodbye. GoSpanish.Com