Few days ago I wrote about the coincidence between the size and distance of the moon and the sun. While I laid down some amazing facts the whole point of that post was the fact that despite the huge difference in their sizes and distance from us they still appear almost exactly the same size in the sky.
I was exited to write about that thing I forgot the mention it clearly in the post. I was carried away by all the details while it was completely clear to me what I was writing about. For somebody reading it the same might not be true. It might seem odd why I would be so exited about those numbers without the implication of it.
Sometimes it's hard to remember to tell your readers what you are writing about. They can't read your thoughts and might need to jump up to a moving train of your thoughts if you don't take a moment to stop and explain where you are taking them first.