Mayanists have noted that the dates of recorded star wars often coincide with astronomical events involving the planet Venus, either when it was first visible in the morning or night sky or during its absence at inferior conjunction. Venus was known to Mesoamerican civilizations as the bringer of war (in contrast to the equivalent European belief assigning that characteristic to Mars). The Maya called it "Chak Ek"' or "Great Star" and made it the focus of detailed astronomical observation and calculation. The Dresden Codex, one of only four surviving Maya books, includes astronomical tables for calculating the position of Venus, which the codex depicts as spearing people as it passes overhead.