What could be the oldest lunar calendar ever created has been identified on the walls of the famous, prehistoric caves at Lascaux in France.

The interpretation that symbolic paintings, dating back 15,000 years, show the Moon going through its different phases comes from Dr Michael Rappenglueck, of the University of Munich.

The German researcher has previously associated patterns left in the caves with familiar stars and constellations.

He now says groups of dots and squares painted among representations of bulls, antelope and horses depict the 27-day cycle of the Earth's satellite.

Works of art...

With special permission from French authorities, I went into the Lascaux caves with Dr Rappenglueck to inspect the paintings for myself. It was an opportunity most people would never get - to protect the historic site from unnecessary wear and tear, all visitors now tour a mock-up of the caves, the so-called Lascaux II.

"The secret of understanding these caves," Dr Rappenglueck told me as we descended into the dark, "is to understand the people who painted these walls.

"They painted the sky, but not all of it. Just the parts that were specially important to them."

With eyes becoming adjusted to the half-light, I entered the Chamber of the Bulls and stood there in amazement. Anyone who has seen the paintings on the walls can be left in no doubt that they represent some of the greatest works of art every created.

The animals were painted on to the walls of the chamber by Cro-Magnon man, one of our close relations, 15,000 years ago. He thrived in a temperate valley in the Dordogne while the rest of Europe was held in the grip of an ice age.

As I marvelled at the spectacle, Dr Rappenglueck moved ahead of me.

Below a stunning painting of a deer was a row of 13 dots, ending in a square. "Why 13?" I ask.

"It's half of the Moon's monthly cycle," Dr Rappenglueck said. "One dot for each day the Moon is in the sky. At the new Moon, when it vanishes from the sky, we see an empty square, perhaps symbolically representing the absent Moon.

"But there's more, further along." The Munich researcher gestured to me to move along the passageway. Beneath a dappled, brown horse with a dark mane was another row of dots. This time there were more of them.

"There are 27 of them - one for each day of the Moon's 27-day cycle when it runs through its phases in the sky. It was a rhythm of nature that was important to these people."

Dr Rappenglueck looked around at the bulls, antelope and horses painted on the walls with such obvious admiration. "They were aware of all the rhythms of nature. Their survival depended on them, they were a part of them."

"I think that indicates the time of the new Moon, when it disappears from the sky for several days," said Dr Rappenglueck.

We will probably never understand completely what Cro-Magnon man had in mind when he painted the Lascaux caves. The images of the animals seem obvious but what are we to make of the geometrical shapes and patterns scattered in between these creatures?

Our best scientists tell us that 15,000 years ago our ancestors were primitive bushmen trying to figure out how many toes they had on their feet. - Why did our ancestors draw these kinds of pictures?
- Did they draw these pictures?
- Why of the Pleiades of all stars and star systems?
- Is the bull in the picture a representation of the constellation Taurus?
- Did our ancestors have help drawing the pictures?
- Who might have given them help?
- Why don't the establishment scientists ask these kinds of questions?
- What are they afraid of?
- Is it possible off-Earth visitors had something to do with it?
- Why is the establishment so afraid to acknowledge this possibility?

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