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Projective Sundial
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Projetive Sundial

Make a hole in the wall

Projective Sundial

Solar Calendar.

Équinox

Leap year

Geographic Coordinates

 

Véalo en:

In conventional sundials the gnomon projects the shadow on a reference frame. The negative clock is the one that projects the rays of light through a crack.

In the graph we show the domes of the cosmic room. Through these domes the rays of light pass over an inner wall during most of the year, let's say, ten out of twelve months.

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These are the rays of light projected through four walls on the wall that face south inside the cosmic room.
 
If we observe closely the mark on the right side, we are able to see it says eleven forty-five
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Now shortly after twelve....

 

Twelve twenty-five....

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Shortly before one in the afternoon, and so on, the clock points the course of time on the south wall.