Libra astronomica ac philosophica : qua Galilaei Galilaei opiniones de cometis a Mario Gvidvcio in Florentina Academia expositae, atque in lucem nuper editae, examinantur (1619)
Grassi, Orazio, 1583-1654 · Perusiae : Ex typographia Marci Naccarini · leaf 26
»SECVNDVM motu Comcetarum expenditur. An Cometes de genere fit apparentium imagi- num, Quzlílo I. … eft in nouo hoc illius inuento diligentius expendendo commorari, Duo ífunt;qua ille excogitauit.alterum fub- ftantiam , alterum vero motum Cometz fpedtat.. Quod per alterius luminisrefractionem olflentata verius, quam facta, vmbra potius luminoforum corporum,quàm lumi- noía corpora dicenda…
Galilei, Galileo, 1564-1642 · Guiducci, Mario, 1584-1646. Discorso delle comete · Astronomy -- Early works to 1800
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
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