1. It's day time and there is not a cloud in the sky. The moon is new, so it's up but you can't see it. You notice a large shadow moving towards you extremely quickly. You can't see what is casting the shadow. What's happening? What is casting the shadow?
2. It's 9 PM and clear. The moon is in third quarter phase. You go outside to observe the moon to complete an Astronomy assignment. You look all over the sky, but don't see the moon. You move to several different locations in case there is a building or trees blocking the moon. You still can't find the moon. Why not?
3. You are an astronaut on the surface of the moon. The Earth is high overhead. The Earth is in third quarter phase. Suddenly there is a bright object on your eastern horizon. What is happening? What is the bright object?