Didn't the Roman Church know that the Gregorian reforms of 1582 return the equinox to March 21 or was the calender change not yet written in 1616?
This is similar to the Council of Trent stating free passage for protestants to attend. However, over the span of 20 years, not one showed up. Did no one show up because they didn't know the council was taking place because it had yet to be written? Even Huss ventured to the Council of Constance to be burned.