It’s not uncommon for calendars, both those used in ancient civilizations to the online calendars we use today, to be based on the Earth’s revolution around the sun. But, other observable phenomena, such as the phases of the moon, have also been used. One long-lasting example of the calendar is the Hebrew Calendar. What’s fascinating […]























Deanna Ritchie
Editor-in-Chief at Calendar. Former Editor-in-Chief, ReadWrite, Former Editor-in-Chief and writer at Startup Grind. Freelance editor at Entrepreneur.com. Deanna loves to help build startups, and guide them to discover the business value and the "how to" of their online content and social media marketing.