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en.wikipedia.org/wiki/Mesoamerican_Long_Count_calendar

The Mesoamerican Long Count calendar is a non-repeating, vigesimal (base-20) and base-18 calendar used by several pre-Columbian Mesoamerican cultures, most notably the Maya. For this reason, it is often known as the Maya (or Mayan) Long Count calendar. Using a modified vigesimal tally, the Long Count calendar  ...

www.yeinfo.com/howto/OldStyleDates.html

Julian Calendar: Julius Caesar put the first modern calendar into use in 45 B.C. He decreed that there should be three years of 365 days each followed by one year of 366 days. This was to keep the calendar close to the actual time it took for the earth to make one trip around the sun. This was a tremendous improvement ...

www.ncbi.nlm.nih.gov/pmc/articles/PMC3904298

Dec 27, 2013 ... More recently, we identified skin-derived precursors (SKPs) with Nf1 deficiency to be a cell of origin for dermal neurofibromas (Le et al., 2009). ..... of tumor evolution, isolation of relatively homogenous cells from spontaneously arising tumors in traditional GEMMs would prove difficult (Heyer et al., 2010).

www.wikitree.com/g2g/408770/gregorian-calendar-v-julian-calendar

Jun 16, 2017 ... I have seen several different questions about the difference between the two calendars. I sometimes forget myself top remember the both calendars. It can make a difference. Here is what I put together. Britain did not start using our current Gregorian Calendar until 1752. Before this time the new year began ...

vpcalendar.net/Difference-Between-Julian-and-Gregorian-Calendars.html

The Difference Between Julian and Gregorian Calendars. The Gregorian Calendar was first introduced by Pope Gregory XIII - which is how the calendar got its name. This calendar has been implemented by several countries because the Julian calendar assumes a full year is 365.25 days whereas it is actually 11 minutes ...