Used to shift topic, introduce a new point, or move a conversation forward. Common in both spoken and written Japanese.
さて、次の議題に移りましょう。
Well, let's move on to the next topic.
さて、どうしたものか。
Now, what should I do?
Well then, let's get going soon.
Now, as for today's agenda, it concerns next year's budget.
さて is used to shift topics or begin a new action ('well, now...'), while はて specifically signals puzzlement or doubt before pondering something.
Rarely used kanji form.
Rarely used kanji form.