The RMA and Maharshal are around 100 years difference from Rishonim ending at the year 1400. The Rambam above Kiddush Hachodash 17:24 says the “goyish” mathematics can be relied on because its truth is evident. If I remember correctly the GRA multiplies the value by 3, why because it is an adjustment as I pointed out, pi/3 has no meaning, there is no indication in pasuk to divide by 3, it happens to have that value.
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