Answer:
I occur twice in eternity. And I'm always within sight.
Some adults still use these to count.
I'm a god. I'm a planet. I measure heat.
Major or minor I can be, when you touch me make sure you that you’re on the right key.
A mechanism to discover who is following you.
What language does a billboard speak?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?