P D Usher
Biographic Data
| ID | 9115976 |
|---|---|
| NAME | P D Usher |
| GIVEN NAMES | P D |
| FAMILY NAME | Usher |
| SIGNATURE | USHER P D |
| AFFILIATIONS | Pennsylvania State University |
| ORCID | 0000-0003-1507-120X |
| VERIFIED | Yes |
| TOTAL WORKS | 6 |
| TOTAL CITATIONS | 0 |
| WORKS AS AUTHOR | 6 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2022 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 0 |
Italic>Peurbach՚S Tabulae Eclypsium
Two of the publications of Thomas Digges on astronomy contain the contradiction that small planetary parallax angles can be measured with a new kind of instrument, but three years later he asserts observational proof of the heliocentric planetary model of Nicholas Copernicus without identifying the new instrument. This assertion rests on the capacity of an instrument to measure angles so small that current instruments like cross-staffs are not eq…
Thomas Digges, the Development of the Relativity of Motion, and Its Relation to the Natural Philosophy of Giordano Bruno
Since the time of ancient Greek scientists, the appearance of similar physical phenomena for two observers in relative motion has been generally exemplified by means of a moving ship. This proved useful in discussions of the rotation of Earth. We briefly track the evolution of this ideal experiment from the time of the exposition in Euclids’ Optics up to Middle and Early Modern Ages, with emphasis on the contribution of Oresme and its use in Cope…
The Sixteenth-Century Empirical Disproof of Ptolemaic Geocentrism
The standard model of the Universe in the 16 th and 17 th centuries was a geocentric planetary system imbedded in a homocentric shell that held the stars. In a previous paper, we discussed the book Alae seu Scalae Mathematicae of 1573 in which Thomas Digges laid out his methodology for the measurement of small diurnal parallaxes of celestial objects. Further, we discussed that book’s sequel, the essay A Perfit Description of the Caelestiall Orbes…
Italic>This Dark Star
of Notre Dame's program in the humanities and a retired financial executive.He holds two Masters degrees, an MBA from
The Sixteenth-Century Empirical Disproof of Ptolemaic Geocentrism
In 1573, Thomas Digges published a book entitled Alae seu Scalae Mathematicae and in 2023 we celebrate the 450th anniversary of its publication. The book was prompted by the apparition of the New Star of 1572, which Digges shows does not change position in the sky. He supplies its distances from some nearby stars in Cassiopeia, but the remainder of the book has long been under-valued. It presents a "new and unheard-of method" of ascertaining diur…
Ancient and Renaissance Astronomers in Shakespeare’s the Tragedy of Hamlet
We examine the role of astronomers in the naming of characters in the First Quarto Q1 (1603) and the Second Quarto (1604) of Shakespeare’s The Tragedy of Hamlet . We approach the task from the standpoint that the play is an allegory for the chief cosmological models in contention during Shakespeare’s lifetime. One of these models is the geocentric model of the Alexandrian astronomer Claudius Ptolemy, and we propose that the names Corambis and Mon…
No prominent works on this page.
Ancient and Renaissance Astronomers in Shakespeare’s the Tragedy of Hamlet
We examine the role of astronomers in the naming of characters in the First Quarto Q1 (1603) and the Second Quarto (1604) of Shakespeare’s The Tragedy of Hamlet . We approach the task from the standpoint that the play is an allegory for the chief cosmological models in contention during Shakespeare’s lifetime. One of these models is the geocentric model of the Alexandrian astronomer Claudius Ptolemy, and we propose that the names Corambis and Mon…
Italic>This Dark Star
of Notre Dame's program in the humanities and a retired financial executive.He holds two Masters degrees, an MBA from
The Sixteenth-Century Empirical Disproof of Ptolemaic Geocentrism
In 1573, Thomas Digges published a book entitled Alae seu Scalae Mathematicae and in 2023 we celebrate the 450th anniversary of its publication. The book was prompted by the apparition of the New Star of 1572, which Digges shows does not change position in the sky. He supplies its distances from some nearby stars in Cassiopeia, but the remainder of the book has long been under-valued. It presents a "new and unheard-of method" of ascertaining diur…
The Sixteenth-Century Empirical Disproof of Ptolemaic Geocentrism
The standard model of the Universe in the 16 th and 17 th centuries was a geocentric planetary system imbedded in a homocentric shell that held the stars. In a previous paper, we discussed the book Alae seu Scalae Mathematicae of 1573 in which Thomas Digges laid out his methodology for the measurement of small diurnal parallaxes of celestial objects. Further, we discussed that book’s sequel, the essay A Perfit Description of the Caelestiall Orbes…
Thomas Digges, the Development of the Relativity of Motion, and Its Relation to the Natural Philosophy of Giordano Bruno
Since the time of ancient Greek scientists, the appearance of similar physical phenomena for two observers in relative motion has been generally exemplified by means of a moving ship. This proved useful in discussions of the rotation of Earth. We briefly track the evolution of this ideal experiment from the time of the exposition in Euclids’ Optics up to Middle and Early Modern Ages, with emphasis on the contribution of Oresme and its use in Cope…
Italic>Peurbach՚S Tabulae Eclypsium
Two of the publications of Thomas Digges on astronomy contain the contradiction that small planetary parallax angles can be measured with a new kind of instrument, but three years later he asserts observational proof of the heliocentric planetary model of Nicholas Copernicus without identifying the new instrument. This assertion rests on the capacity of an instrument to measure angles so small that current instruments like cross-staffs are not eq…
Historical Astronomy and Related Studies (4 works) · History (4 works) · History and Developments in Astronomy (3 works) · Physics (3 works) · Ancient history (2 works) · History of Science and Medicine (2 works) · Archaeology (1 work) · Art (1 work) · Art history (1 work) · Assertion (1 work)