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Circulus aequinoctialis
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Circulus aequinoctialis[1] sive (circulus) aequator[2] est maximus circulus telluris, qui aeque remotus a polo septentrionali quam a polo australi iacet. Circulus magnus in sphaera dicitur, qui descriptus in superficie sphaerae super eius centrum sphaeram in duas partes aequales dividit.
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Secundum Mariam Delcourt linea aequinoctialis pristinum vocabulum erat ad hanc rem significandam adhibitum, et aequator monetae homo erat qui monetas probabat (haec confer: [3][4]), sed cosmographi Medii Aevi verbo aequatore utebantur ut lineam aequinoctialem designarent.
Aequator linea propinquissimum punctum in caelo, est ex figura in terra. Simul mari summo linea aequinoctiali gradus.[5]