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Celestial Sphere with Analemma JS Model
written by Todd Timberlake and Wolfgang Christian
The Celestial Sphere and Analemma JavaScript Model simulates the Two Sphere Universe theory of the Ancient Greeks. This theory supposes the stars to be fixed on the surface of a Celestial Sphere, with the spherical Earth at the center of this sphere. The simulation shows the motion of Sun and stars in this model, as well as the horizon plane for an observer on the spherical Earth. Two views are shown: one from outside the Celestial Sphere, and the other from the point of view of an observer on Earth looking up. Most of the characteristics of the simulation can be adjusted, including the tilt of the ecliptic relative to the equator, the latitude of the observer, the time of day and the time of year.

The Celestial Sphere and Analemma JavaScript Model was developed using the Easy Java/JavaScript Simulations (EJS) modeling tool. Although EJS is a Java program, EJS v5 and above can be used to create stand-alone JavaScript programs that run in almost any browser.
1 source code document is available
Subjects Levels Resource Types
Astronomy
- Astronomy Education
= Curricula
- Fundamentals
= Celestial Mechanics
= Night Sky
- Historical Astronomy
= History of Astronomy
- Lower Undergraduate
- Middle School
- High School
- Upper Undergraduate
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- General Publics
- text/html
- application/zip
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Access Rights:
Free access
License:
This material is released under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.
Rights Holder:
Wolfgang Christian
Keywords:
Earth, Sun, celestial globe
Record Cloner:
Metadata instance created April 24, 2017 by Wolfgang Christian
Record Updated:
January 25, 2023 by Lyle Barbato
Last Update
when Cataloged:
April 24, 2017
Other Collections:

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