Well, an objective summary basically sums up the main key points, or the theme. It's like telling your friend about this passage. What would you tell them? What does the setting look like? Characters? Examples of an objective summary would be talking about what happened and what you think is most important throughout the story. Like in this story, I suggest write about their conversation. What are they talking about? What seems to be important here?
At a minimum, readers know that Fahrenheit 451 takes place sometime after 1990. The story may take place in the later 1900s or well into the 21st century.
