ms 1m AvSTRIACA SIDERA in quo angulum Ecliptice cum meridiano teprxfentari monfílrauimus. | Adcirculos veró horariosin iníttumentonotatos quod attinet , hi aliud nihil funt quàm ipfíe fe&iones hora- riorum circulornm cum circulo Zenithali. nam vt cir- culus ille, oculo ad varias declinationes…
Astronomy -- Early works to 1800
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
![An illustration from Isaaci Newtoni Optices libri tres: accedunt ejusdem lectiones opticae, et opuscula omnia ad lucem et colores pertinentia sumpta ex Transactionibus philosophicis / [Sir Isaac Newton]. (1773)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b30415561-107-1.webp)
