This is the 12299th most frequent Spanish word.
lejanos
"Distant" or "far away."
Here, 'lejanos' modifies 'días' to describe them as being distant or far away in time.
Los días lejanos traen recuerdos de nuestra infancia.
Distant days bring back memories of our childhood.
In this sentence, 'lejanos' describes 'países', indicating their physical distance or remoteness from the speaker's location.
Los países lejanos tienen culturas muy diferentes.
Distant countries have very different cultures.
Here, 'lejanos' describes 'mundos', conveying their spatial or conceptual distance from the speaker or what they know.