Assertion: leap year's day | /r/HasProperty | relative error of 9·10−8
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Source sentences:
text: The Revised Julian calendar, proposed in 1923 and used in some Eastern Orthodox Churches, has 218 leap years every 900 years, for the average (mean) year length of 365.2422222 days, close to the length of the mean tropical year, 365.24219 days (relative error of 9·10−8).