Astronomy
Found in 89 Collections and/or Records:
De affirmanda parallaxi magni orbis, cogitatum Hugenii, June 1693
A transcription of Christiaan Huygen's argument that because stars' observed radii are so insensibly small, the diameter of the earth's orbit relative to the stars' position is also insensible, and thus the parallax measurement, which ought to prove or disprove the Copernican layout of the heavens, is useless.
De Heliaco orta Sirii anno ante Christum 2783, a.D. Wills..., 1696
This paper, says Gregory himself, is for a Doctor Wills at Oxford, who undertakes to give a solstice long before that adduced by Hyparchus.
De natura rerum by Isidore of Seville, 12th-13th century
De Parallaxi Magni Orbis. Jac. Gregorius, before 1675
A draft of the parallax method of proving the earth's motion, i.e., by measuring the angular distance between two stars from diametrically opposite points in the earth's orbit. This was consulted by David in the course of preparing his Astronomiae.
Descriptio Christalli Heddintomani, c17 May 1697
Drafts and notes, c. 1932-1946
The material consists of 5 files containing material relating to Edward Appleton's research into meteors.
Eclipses and latitude, c1700
Calculation of London's latitude, given the times that certain eclipses happened around the globe.
Eclipses and latitude, 1698-1700
Published resources for the Astronomiae.
Elementa Astronomiae, conscribenda a D.G. et al., 23 April 1697
The basic planning document for David Gregory's major work, composed probably in conference, at eleven thirty in the morning, 23 April, 1697, with the collaborators' initials at the top.
Errata, 1704
List of locations, apparently within the Astronomiae, where editorial changes are due.