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"In a Year of 13 Moons"
"Randall Coleman" wrote in
news:np34h.695$L35.633@trnddc02: wrote ... not quite the same vocabulary, but I work for a company that works on a 13 period accounting calendar. So we recieve 13 pay cheques a year, one every 4 weeks. However, every seven years we have a 53 week year, whereby one of 'periods' is 5 weeks instead of four ... a similar mechanism for the same problem Thanks for that input. I haven't found a calendar system that makes an adjustment every seven years, but your post verifies that that can work. You posted to the wrong group. If you'd posted to sci.astro, you would have had more expert answers than you could answer. They're talking about our calendar. There is no system that adjusts the calendar every seven years. Until I read the first response, I thought that there were always 13 months in a year. If there are 12 and a fraction months in one, then every few years that fraction will align just right so that the year both begins and ends with a new moon (or a full one, if you prefer). Then there are 13 "moons" in a year. If the first responder's numbers are accurate, that number is not 7. He quoted 12.38 months per year, which means that it would happen every three years, with a further correction for the gradual accumulation of the renmaining 0.05. Thus, ever twenty years, you would have a thirteen month year every two years. I suspect that the number 7 is taken from the number of days in the week, although I can't quite put my finger on what they were trying to conjure up. |
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"In a Year of 13 Moons"
"John Schutkeker" wrote in message . 17.102... "Randall Coleman" wrote in news:np34h.695$L35.633@trnddc02: wrote ... not quite the same vocabulary, but I work for a company that works on a 13 period accounting calendar. So we recieve 13 pay cheques a year, one every 4 weeks. However, every seven years we have a 53 week year, whereby one of 'periods' is 5 weeks instead of four ... a similar mechanism for the same problem Thanks for that input. I haven't found a calendar system that makes an adjustment every seven years, but your post verifies that that can work. You posted to the wrong group. If you'd posted to sci.astro, you would have had more expert answers than you could answer. They're talking about our calendar. There is no system that adjusts the calendar every seven years. Until I read the first response, I thought that there were always 13 months in a year. If there are 12 and a fraction months in one, then every few years that fraction will align just right so that the year both begins and ends with a new moon (or a full one, if you prefer). Then there are 13 "moons" in a year. If the first responder's numbers are accurate, that number is not 7. He quoted 12.38 months per year, which means that it would happen every three years, with a further correction for the gradual accumulation of the renmaining 0.05. Thus, ever twenty years, you would have a thirteen month year every two years. I suspect that the number 7 is taken from the number of days in the week, although I can't quite put my finger on what they were trying to conjure up. Thanks for the suggestion. I posted my question at sci.astro. Let's see if I get any results. Randall Coleman |
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"In a Year of 13 Moons"
John Schutkeker (or somebody else of the same name) wrote thusly in message
02: Until I read the first response, I thought that there were always 13 months in a year. If there are 12 and a fraction months in one, then every few years that fraction will align just right so that the year both begins and ends with a new moon (or a full one, if you prefer). Then there are 13 "moons" in a year. It's very nearly 12 8/19 lunar months in a year. (Actually a wee bit less, it was more exact when the Julian calendar was in use.) Thus the sequence of new moon dates will repeat every 19 years (228 calendar months, 236 lunar orbits), the so-called "golden number" sequence in which each year is allocated a number from 1 to 19. The golden number 1 is taken by years which are multiples of 19, most recently 1995. The year 2006 has the golden number 12. The same fraction 8/19 is the reason why the Jewish calendar puts a 13th month in the year eight times in a 19-year cycle. -- Terms and conditions apply. Batteries not included. Subject to status. Always read the label. Interchange the alphabetic letter groups to reply |
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"In a Year of 13 Moons"
In article ,
Prai Jei wrote: John Schutkeker (or somebody else of the same name) wrote thusly in message 02: Until I read the first response, I thought that there were always 13 months in a year. If there are 12 and a fraction months in one, then every few years that fraction will align just right so that the year both begins and ends with a new moon (or a full one, if you prefer). Then there are 13 "moons" in a year. It's very nearly 12 8/19 lunar months in a year. (Actually a wee bit less, it was more exact when the Julian calendar was in use.) One synodic month = 29.530588853 days 29.530588853 * (12 + 8/19) = 366.800998.... 29.530588853 * (12 + 7/19) = 365.246756.... A year isn't very nearly 366.8 days..... :-) Thus the sequence of new moon dates will repeat every 19 years (228 calendar months, 236 lunar orbits), the so-called "golden number" sequence in which each year is allocated a number from 1 to 19. The golden number 1 is taken by years which are multiples of 19, most recently 1995. The year 2006 has the golden number 12. The same fraction 8/19 is the reason why the Jewish calendar puts a 13th month in the year eight times in a 19-year cycle. -- ---------------------------------------------------------------- Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN e-mail: pausch at stockholm dot bostream dot se WWW: http://stjarnhimlen.se/ |
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