Above us: The firmament. It is there, we see it every day and every night.
I think I remember when I first saw the Milky Way in her full glory. It was in Switzerland, as I cannot see it as clear in the place where I live. due to much light pollution.Nowadays I cannot see it at all.

And it was amazing and mesmerising.

My father had been a sailor, and loved explaining the sky to me. I was told the names of Deneb, Altair and Vega that were used to navigate at night, way before there was gps. And about the different constellations to get your direction. And I got fascinated and always have been. One of the first things I did when I was in Kenya, just a few years ago, was look up. Because the sky was different. I could see stars I had not seen before; The southern cross for instance. At that time I was lucky to have an app on my phone with the night sky, which made things much easier.

And there off course are the planets and moons. Some you can see just looking up, most are indistinguishable from the stars with the naked eye.
The moon is easiest to find.. easy and fascinating in itself, as you only can see one side of the moon. How much easier it would have been if we could see the moon spinning.

And finally: The Sun, or very own star.

But what are they and what can we tell about them. This is where flat earth and global earth are different in the view of things. Because if one believes the earth is flat, stationary and the centre of the universe, then what do we see when we look up.

And looking up, how can we begin to explain what we experience: Day and Night, Polar night and days, Seasons, Eclipses. The movement of the planets, spinning themselves. And why can we only see one side of the moon from earth? And finally: Why, if we are moving at giant speeds across the galaxy, can't we see that movement. Constellations have not changed in centuries, or so it seems.
And this is the fascination every astronomer has.

So.. two models totally different.

The global model

 

The flat earth model

 

An animation of a flatearth model. This model of flatearth seems to be the most accepted version. It is based on the map created by gleason. (See map section on this site).

Another animation of a flatearth model, with paths of other planets explained. Note that this is not an accepted model, just an impression

Not going into the specifics of the different earth model (this will be done in the map section), there is still the issue of what we can see in the sky. And how it fits into our view of the world.