Really great place to go for a day with a kid.
Just next to Ekamai BTS station. Actually just next to Ekamai bus station.
https://www.google.com/maps/place/Ba...!4d100.5827043
Big complex with a great planetarium. The shows are on at 10am, 2pm and 3pm.
One English one per week, on Tuesday at 10am. The rest are in Thai.
Closed on Mondays and holidays.