julian calendar

100 years ago, how did Russia take 13 days in February?
The entire population of Russia took nearly half a February, exactly 13 days from 100 years ago.
This is what really created a glorious Roman empire
Although the Roman Empire had collapsed from more than 1500 years ago, the tangible and intangible heritage it left still exists today.
Why need a leap year?
2016 is a leap year. February 29, 2016 will be another day to add to the calendar to help synchronize the rotation of the Earth around the sun and the true passage of seasons.
October 1582 calendar with 10 days does not exist
Before 1582, Europeans and colonies used a calendar based on the Julian calendar given by Emperor Julius Caesar in 46 BC.