Answer:
I occur twice in eternity. And I'm always within sight.
You do this into someone's ear when you want to be discreet.
If the day before yesterday is the 23rd, then what is the day after tomorrow.
Humans have two that shrink in the light and expand in the dark
I go around in circles, But always straight ahead Never complain, No matter where I am led.
I am a room that has a roof but no walls. What am I?