![]() Pair Aims to Scrap the Gregorian Calendar by 2017 At that time, February was the last month of the year. This new "Julian" calendar was used throughout the Roman Empire and by various Christian churches. So to account for that residual quarter of a day, an extra day - a leap day - was added to the calendar every four years. ![]() 29 - the bissextle or "leap day," an artifact that dates back to the year 46 B.C.īack then, Julius Caesar took the advice of the learned astronomer Sosigenes of Alexandria, who knew from Egyptian experience that the tropical year (also known as the solar year) was about 365.25 days in length. Hence the later Gregorian reforms.Today is Feb. What they didn't do was the longer term work to see that adding a day every 4 wasn't entirely accurate and added to many days. It was a problem when Rome spanned the Med. It worked well when Rome was small and only the city had to be told a day (or days/a month) was being added this year. It was also interrupted by civil strife and had to be communicated out to the provinces. The previous Roman model to add days as they felt the needed to and was often politically driven (extending terms, screwing rivals). The Romans adopted the Egyptian model which Caesar had seen in Egypt. The Egyptians had already done all this work anyway. Over long periods it become apparent that just adding a day every four years would solve the problem. Then they recorded how many years it took for the sunrise due east to be off by a full day. Its very apparent that is 365 days between vernal equinoxes. The sun was supposed rise on Mar 20/21 (or whatever date they arbitrarily chose) due east. All the Romans had to do was determine which way was due east. A set of sticks lined up due east/west will do, or some aligned rocks. You don't need sophisticated tools to record sunrise/sunset. We make our world significant by the courage of our questions and by the depth of our answers. For more open-ended questions, try /r/AskScienceDiscussion | Sign up to be a panelist!.Looking for flair? Sign up to be a panelist!.Chris Ferrie, Science Books for Kids (and Adults!)Īsk Anything Wednesday - Engineering, Mathematics, Computer scienceĪsk Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Neil Theise, Consciousness and ComplexityĪsk Anything Wednesday - Physics, Astronomy, Earth and Planetary ScienceĪskScience AMA Series: Dr. Neuroscience, Neurology, Neurochemistry, Cognitive NeuroscienceĪskScience AMA Series: Viral Illnesses and Neurodegenerative DisordersĪsk Anything Wednesday - Economics, Political Science, Linguistics, AnthropologyĪskScience AMA Series: Dr. Medicine, Oncology, Dentistry, Physiology, Epidemiology, Infectious Disease, Pharmacy, Human Body Psychology, Cognitive Psychology, Developmental Psychology, Abnormal, Social Psychology Social Science, Political Science, Economics, Archaeology, Anthropology, Linguisticsīiology, Evolution, Morphology, Ecology, Synthetic Biology, Microbiology, Cellular Biology, Molecular Biology, Paleontology Mechanical Engineering, Electrical Engineering, Structural Engineering, Computer Engineering, Aerospace EngineeringĬhemistry, Organic Chemistry, Polymers, Biochemistry Mathematics, Statistics, Number Theory, Calculus, AlgebraĪstronomy, Astrophysics, Cosmology, Planetary FormationĬomputing, Artificial Intelligence, Machine Learning, ComputabilityĮarth Science, Atmospheric Science, Oceanography, Geology Theoretical Physics, Experimental Physics, High-energy Physics, Solid-State Physics, Fluid Dynamics, Relativity, Quantum Physics, Plasma Physics /r/AskScienceDiscussion: For open-ended and hypothetical questions.FAQ: In-depth answers to many popular questions.Weekly Features: Archives of AskAnything Wednesday, FAQ Fridays, and more!. ![]() Be civil: Remember the human and follow Reddiquette.Report comments that do not meet our guidelines, including medical advice.Downvote anecdotes, speculation, and jokes.Upvote on-topic answers supported by reputable sources and scientific research.Answer questions with accurate, in-depth explanations, including peer-reviewed sources where possible.Please read our guidelines and FAQ before posting
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