Observatory Borges


Spanish

Equinox

Inside the cosmic room, a hole was made on the wall facing west, right next to the south wall. Through this hole during the equinox, the sunrays fall almost parallel to the wall since it is not in the exact position.

On the east wall, another hole was made so that during the equinox the sunrays pass exactly through it and so they could be projected up to the door of the next room.

 

If a day during the equinox isn't sunny, the light is projected as it is shown in the right graph.
The sun doesn't pass through this little hole every year, that depends on how far it is from the leap year. Every year that goes by, it gets further and in a leap year it comes back again.

In the video you can see how it changes the position of the sun every year.

In the video you can see how it changes the position of the sun every four years .