Armillary sphere - Wikipedia
An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial longitude and latitude and other astronomically important features, such as the ecliptic.
WHAT IS AN ARMILLARY SPHERE, AND HOW DOES IT WORK?
2022年8月21日 · In this article, we'll explore how the armillary sphere works, what the rings on it show, and how it helps visualize the movement of the Sun on the celestial sphere. The armillary sphere is an ancient astronomical instrument that demonstrates the movement of …
Armillary sphere | Navigation, Celestial, Celestial Sphere | Britannica
Armillary sphere, early astronomical device for representing the great circles of the heavens, including in the most elaborate instruments the horizon, meridian, Equator, tropics, polar circles, and an ecliptic hoop.
The History of the Armillary Sphere - ThoughtCo
2019年2月22日 · An armillary sphere is a miniature representation of celestial objects in the sky, depicted as a series of rings centered around a globe. Armillary spheres have a long history.
What Is An Armillary Sphere? - Sciencing
2018年10月9日 · An armillary sphere is a tool that can be used to solve various astronomical problems or as an educational tool to represent movements in the heavens. An armillary sphere can be used to track the path of the sun for a day of the year or to determine the coordinates of a star, among other things.
Armillary Sphere | Harvard Natural Sciences Lecture …
The position and motions of heavenly bodies are projected against a hypothetical sphere of infinite radius, centered on the Earth, called the Celestial Sphere. With this demo you can explain the motions of the stars and of the Sun, and show various aspects of the seasons.
Armillary sphere | History of Science Museum
Armillary spheres date back to the ancients, and were certainly used by the 2nd-century astronomer and mathematician Claudius Ptolemy of Alexandria. They were mathematical instruments designed to demonstrate the movement of the celestial sphere about a stationary Earth at its centre.
Armillary Spheres and Teaching Astronomy | Whipple Museum
Armillary spheres are models of the universe. They have been used since antiquity, but very few survive from before the 16th century. The Whipple Museum has one very early example, though dating it accurately is extremely difficult.
Starry Messenger: The Armillary Sphere - University of Cambridge
Armillary spheres can be divided into two main categories: the observational armillary, as used by Ptolemy and Tycho Brahe; and the demonstrational instrument. Both types consist of a number of rings (Latin: armillae) which are arranged so as to model the circles of the celestial sphere.
Armillary Sphere - History and Types of Armillary Spheres - The …
One of the first models ever made was the armillary sphere, supposedly a model of the universe. By moving the armillary rings, you could demonstrate how the stars moved. However, early models had the Earth at the center of the universe.