- "A planet rotating causes cycles of day and night on that planet " is not relevant

- Removing hot objects from a heat source requires thermal insulators
- An oven is a source of heat
- A pan is a kind of object
- So, removing a hot pan from an oven requires a thermal insulator

- Removing a hot pan from an oven requires a thermal insulator
- Potholders are used to remove hot pans from an oven
- Therefore, potholders are used as a thermal insulator to remove a hot pan from an oven

So, potholders are used as a thermal insulator to remove a hot pan from an oven
When potholders are used to remove hot pans from an oven, the potholders are serving as
- Potholders are used to remove hot pans from an oven 
- Removing hot objects from a heat source requires thermal insulators 
- An oven is a source of heat 
- A planet rotating causes cycles of day and night on that planet 
- A pan is a kind of object