...To Gregory we owe the canto fermo,or Gregorian chant, which, if properly executed, impartssuch a grave and solemn character to the ceremonies of ourchurch... 
Rodolfo Lanciani 「Pagan and Christian Rome」
...The agreement between thecalendar and nature has thus been fairly perfect, since theestablishment of the Gregorian Calendar in 1582...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...Omar, a Persian astronomer, suggested a reformation of thecalendar which, if it had been adopted, would have insured greateraccuracy than can be attained by the Gregorian style now in use...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...The Gregorian had thus the sentimentaladvantage of being pointed directly at the object...
Cecil G. Dolmage 「Astronomy of To-day」
...An adaptation of the Gregorian was the"Cassegrainian" telescope, devised by Cassegrain in 1672, which differedfrom it chiefly in the small mirror being convex instead of concave (, p...
Cecil G. Dolmage 「Astronomy of To-day」
...Finally, in 1774, he had made himself a Gregorian telescope, and hadbegun to view the heavens...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...Before his time theprincipal aids to observation were the Gregorian and Newtoniantelescopes of , and the small achromatics of ...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...In this way I made not less than two hundred seven-foot, one hundred and fifty ten-foot, and about eighty twenty-foot mirrors, not to mention the Gregorian telescopes...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...—A problem similar to theabove but more complicated consists in finding the day ofthe week on which any given date of the Gregorian calendarfalls—e...
George C. Comstock 「A Text-Book of Astronomy」
...After repeated failures he at lengthcompleted a 5½-foot Gregorian reflector, and with this instrumentmade his first survey of the heavens...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...The Julian and Gregorian calendars are frequently representedby the abbreviations O...
George C. Comstock 「A Text-Book of Astronomy」
...What is the correspondingdate in the Gregorian calendar?...
George C. Comstock 「A Text-Book of Astronomy」
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