It's amazing that they calculated it down to that detail in the 1700s. Before that they were just a hares breath off for 1000 years (Julian calender -> Gregorian calender). It became a real issue for the church that the start of spring didn't align with the calendar anymore, and they needed to know exactly when Easter was to be held.
It why George Washington is credited with 2 birthdays, depends on which calender you're going by. I think Russia was the last major country to adopt it.
But the earth is flat and pyramids=aliens. Uh huh. Yup.