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+--- Thread: Grimm's Baby Kelly: Time to Step Up (/Thread-Grimm-s-Baby-Kelly-Time-to-Step-Up--3655)
RE: Grimm's Baby Kelly: Time to Step Up - MarylikesGrimm - 04-07-2017
(04-07-2017, 09:11 AM)brandon Wrote: Not end of the world. It Is end of year Maya.
The calendar the 4th crusaders would have been using would have been off by one day every 128 days so that translates to being off about 6.4 days by 2017.
Fourth Crusade was from 1202 to 1204, 4th Crusaders led by Fulk of Neuil French/Flemish advanced on Constantinople.
http://www.lordsandladies.org/crusades-timeline.htm
https://www.wwu.edu/skywise/leapyear.html
Systematic Error
No calendar is perfect. To make a calendar a better measure of the Earth's orbit around the Sun, leap year rules were created and have since been modified. These improvements have brought a close correlation between the calendar and the orbit, but the calendar year will always be an approximation.
Calendar Introduced Length of Year (average) Approximate Error
Gregorian 1582 AD 365.2425 days 27 seconds 1 day every 3236 years
Julian 46 BC 365.25 days 11 minutes 1 day every 128 years
365 day Ancient 365 days 6 hours/year (1 day every 4 years)