3. sončev cikel je bil tretji sončev cikel od leta 1755, ko se je začelo obdobje obširnejših sončevih peg.[1][2] Sončev cikel je trajal 9,3 let, z začetkom junija 1775 in koncem septembra 1784. Maksimalno zglajeno število sončevih peg med ciklom (po formuli SIDC) je bilo 264,3 (maja 1778), na začetku minimuma pa je bilo 12,0.[3]
William Herschel je začel z opazovanjem sončevih peg med tem sončevim ciklom.[4]
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