Dr Michael Rappenglueck identified prehistoric lunar calendar in Lascaux caves France. Paintings created 15,000 years ago by Cro-Magnon man during last ice age. Calendar three times older than Neolithic moon map at Knowth Ireland. Dots and squares among bulls antelope horses depict moon phases. One painting shows 13 dots and empty square for half lunar cycle plus new moon. Another shows 27 dots for full lunar cycle days. Pleiades star cluster painted above bull. Moon phase knowledge essential to ancient civilization. Caves discovered 1940 closed 1963 due to human breath damage. Lascaux II replica built for visitors. Rappenglueck previously identified constellations and stars in caves.