Answer:
I occur twice in eternity. And I'm always within sight.
This is your stomach's way of letting you know you've neglected it.
The eight of us go forth not back to protect our king from a foe's attack. What are we?
Barren location, infertile and dry; my name means "to leave", it's not heard to see why
What has thousands of ribs and two backbones?
The warmer I am the fresher I am.