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" "To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
Sir Isaac Newton (January 4, 1643 – March 31, 1727 or in Old Style: December 25, 1642 – March 20, 1727) was an English mathematician, physicist, astronomer, alchemist, theologian, and author (described in his time as a "natural philosopher"), widely recognised as one of the greatest mathematicians and physicists and among the most influential scientists of all time. He was a key figure in the philosophical revolution known as the Enlightenment. His book Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), first published in 1687, established classical mechanics. Newton also made seminal contributions to optics, and shares credit with German mathematician Gottfried Wilhelm Leibniz for developing infinitesimal calculus.
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1. Fidelity & Allegiance sworn to the King is only such a fidelity and obedience as is due to him by the law of the land; for were that faith and allegiance more than what the law requires, we would swear ourselves slaves, and the King absolute; whereas, by the law, we are free men, notwithstanding those Oaths. 2. When, therefore, the obligation by the law to fidelity and allegiance ceases, that by the Oath also ceases...
Qu. 21. Is not this Medium [æther] much rarer within the dense Bodies of the Sun, Stars, Planets, and Comets, than in the empty celestial Spaces between them? And in passing from them to great distances, doth it not grow denser and denser perpetually, and thereby cause the gravity of those great Bodies towards one another, and of their parts towards the Bodies; every Body endeavouring to go from the denser parts of the Medium towards the rarer? ...And though this Increase of density may at great distances be exceeding stow, yet if the elastick force of this Medium be exceeding great, it may suffice to impel Bodies from the denser parts of the Medium towards the rarer, with all that power which we call Gravity. And that the elastic force of this Medium is exceeding great, may be gather'd from the swiftness of its Vibrations.
The times of the Birth and Passion of Christ, with such like niceties, being not material to religion, were little regarded by the Christians of the first age. They who began first to celebrate them, placed them in the cardinal periods of the year; as the annunciation of the Virgin Mary, on the 25th of March, which when Julius Cæsar corrected the Calendar was the vernal Equinox; the feast of John Baptist on the 24th of June, which was the summer Solstice; the feast of St. Michael on Sept. 29, which was the autumnal Equinox; and the birth of Christ on the winter Solstice, Dec. 25, with the feasts of St. Stephen, St. John and the Innocents, as near it as they could place them. And because the Solstice in time removed from the 25th of December to the 24th, the 23d, the 22d, and so on backwards, hence some in the following centuries placed the birth of Christ on Dec. 23, and at length on Dec. 20: and for the same reason they seem to have set the feast of St. Thomas on Dec. 21, and that of St. Matthew on Sept. 21. So also at the entrance of the Sun into all the signs in the Julian Calendar, they placed the days of other Saints; as the conversion of Paul on Jan. 25, when the Sun entered Aquarius; St. Matthias on Feb. 25, when he entered Pisces; St. Mark on Apr. 25, when he entered Taurus; Corpus Christi on May 26, when he entered Gemini; St. James on July 25, when he entered Cancer; St. Bartholomew on Aug. 24, when he entered Virgo; Simon and Jude on Oct. 28, when he entered Scorpio: and if there were any other remarkable days in the Julian Calendar, they placed the Saints upon them, as St. Barnabas on June 11, where Ovid seems to place the feast of Vesta and Fortuna, and the goddess Matuta; and St. Philip and James on the first of May, a day dedicated both to the Bona Dea, or Magna Mater, and to the goddess Flora, and still celebrated with her rites. All which shews that these days were fixed in the first Christian Calendars by Mathematicians at pleasure, without any ground in tradition; and that the Christians afterwards took up with what they found in the Calendars.