When is the new year? Is it marked by a birthday? An anniversary? When the school year starts? Is it when the fiscal year begins? Or do you think of January 1st, the first day of the Gregorian calendar, which is the most commonly used calendar in the world? Whether we realize it or not, we all mark several “new years” over the course of 365 days. Within those, we also account for cultural variations. For example, school commonly starts in September in the northern hemisphere. But, school starts in January in the southern one so that summer vacation takes place during warmer months. Or, Islam follows a pure lunar calendar (based on the rotation of the Moon around Earth). But, Chinese culture follows a solilunar calendar (based on both lunar and solar cycles). Do you want to know more about the Jewish High Holy Days? Then test your knowledge with our fun Rosh Hashanah quiz below!