Prague's planetarium and its Astronomical Clock share a sky theme, not a neighborhood. The planetarium is at Výstaviště near Stromovka, while the medieval clock is on Old Town Square. Treat them as separate experiences, perhaps on different days. One is a scheduled immersive program; the other is a short public spectacle best understood with a little context.
Choose a planetarium program
Planetum schedules programs by age, language, length, and projection format. Check the current listing and renovation or technical status on the official site. A show labeled for schools may not suit a toddler or an English-speaking visitor. Ask about late seating, sensory effects, stroller storage, and whether a child who becomes unsettled can leave safely during darkness.
Use the surrounding area
Arrive early enough to find the entrance without rushing, then use Stromovka for outdoor movement before or after the show. Výstaviště events can change tram stops and pedestrian routes. Verify low-floor departures and current construction. Do not add Prague Zoo simply because it appears north of the center; it is a separate full-day destination across the river.
See the Astronomical Clock briefly
The clock's hourly display draws dense crowds and lasts only a short time. Stand where children can see without lifting them above other visitors or placing a stroller in the main flow. Secure valuables and keep an exit route. Early morning offers a calmer look at the dial even when the animated display is not your priority.
Explain, then move on
Show children the clock's calendar dial, Sun, Moon, and moving figures at a level appropriate to them; do not expect the mechanism alone to hold a toddler's attention. Pair Old Town Square with a riverside walk or snack. Check any tower ticket, lift, and stroller restrictions separately, because viewing the exterior does not imply accessible entry to the tower.