Getting Started Basics and Cognition

Starting from what you have seen about the moon, the four seasons, and the starry sky, you can build up your intuition for direction, movement, and size.

There is no need to learn the algorithm first; just follow the diagram and then try to explain it in your own words.

Let’s look at the phenomena in life first →

• Why does part of the Moon seem to disappear?

  We stay on the earth and watch how the bright side of the moon turns towards us little by little as it orbits.

• Why does it get dark earlier when the sun is lower in winter?

  Standing in the same place, watching the sun in winter and summer take two different paths.

• How high should you raise your head when you see a star?

  Turn the abstract "elevation angle" into the action of raising your head while standing on the ground.

• After turning around in a full circle, why are you still facing the same house?

  Use turning to find the direction, and distinguish "how much you turned" and "where you ended up heading."

• Why do some stars never set all night long?

  Standing on the ground and looking at a circle of stars, the horizon is the boundary between "visible" and "blocked".

• The sun is so big, why does it look about the same size as the moon?

  The size of the disk in front of you depends on how big the object is and how far it is from you.