Candles in eg religious orders.
Sand-glass aboard ship.
Sundial could be as simple as a stick and a few scratches. IIRC, there were even *pocket* sun-dials and moon-dials.
Um, before modern sextants and 'shooting the sun', there were eye-ball navigation / optical astronomy stuff going back to the Sumerians etc who named the ecliptic's dozen constellations.
( And, yes, polar wobble etc has long-since rendered those designations obsolete-- so *Phaw!* to modern 'Astrologers' and their ilk ;- )
Marked staffs and cross-pieces and weighted strings, engraved, nested brass disks that resembled circular slide-rules etc etc.
Oh, and do NOT forget the Antikythera whatsit.
Antikythera mechanism - Wikipedia, the free encyclopedia