The frog is right; there were originally 13 divisions to the zodiac, and there are still 13 months on the lunar callendar.
The Hebrew, Buddhist, Hellenic, Hindu lunisolar, Burmese, Tibetan, Chinese, Vietnamese, Mongolian, and Korean calendars are all lunisolar, as was the Japanese calendar until 1873, the pre-Islamic calendar, the first century Gaulish Coligny calendar, and the Babylonian calendar. The Chinese, Coligny and Hebrew lunisolar calendars track more or less the tropical year whereas the Buddhist and Hindu lunisolar calendars track the sidereal year. Therefore, the first three give an idea of the seasons whereas the last two give an idea of the position among the constellations of the full moon. The Tibetan calendar was influenced by both the Chinese and Hindu calendars. The Germanic peoples also used a lunisolar calendar before their conversion to Christianity.