Alexander Marshack係一本好有爭議性嘅書入面認為一個骨棒上面嘅痕跡(c. 25，000 BC)代表太陰曆，而Michael Rappenglueck亦都認為一幅15，000年前嘅洞穴畫入面就有太陰曆。
Alexander Marshack is a controversial book that argues that the marks on a bone stick (c. 25,000 BC) represent the lunar calendar, and Michael Rappenglueck also believes that a 15,000-year-old cave painting contains a lunar calendar.