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Birkas Hachamah is recited every 28 years based on Tekufas Shmuel (Julian years) that a year is 365.25 days. The Rambam in &&Hilchos Kiddush Hachodesh 9:3 states that tekufas Nissan of year 1 was 7 days + 9 hours before molad Nissan. This is calculated as every 10,227 days (28 * 365.25).
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true for a day that Birkas Hachamah is recited.