Reb Eliezer, what you’re missing is that the Gregorian correction (10 days in the 16th century, plus 3 days since) brings the equinox back to what it was in the 4th century, when the date of Easter was established at the council of Nicaea. At that time the March equinox was on March 21, so Gregory corrected the calendar to bring it back to that date. But our Tekufos were set about 500 years before then, so Tekufas Nissan, instead of being on April 3 (March 21 + 13 days) is four days later, on April 7. This is also why Xmas is on the 25th rather than the 21st.
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