The twelve signs of the zodiac are not symbols. They are sentences the Greek gods wrote in the sky so no one would forget what happened.

Neil deGrasse Tyson explains the logic behind the leap year, with a brief history in calendars as well.

What’s your sign? In Western astrology, it’s a constellation determined by when your birthday falls in the calendar. But according to the Chinese zodiac (生肖), it’s your shuxiang, meaning the animal assigned to your birth year. Of the many myths explaini...