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written by Todd Timberlake
The EJS Equinox Precession model illustrates the Copernican theory of Earth's orbit around the sun. The top window shows a view from outside the celestial sphere. The simulation shows the moving Earth along with its axis or rotation and the line of sight from Earth, through Sun, to the Celestial Sphere. The end of the arrow indicates where, on the Celestial Sphere, Sun appears to be located as seen from Earth. The tilt of Earth's rotational axis (relative to the ecliptic plane) is adjustable. The bottom window shows the view of a portion of the sky (near the ecliptic) as seen by an observer on Earth.  You can modify this simulation if you have EJS installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.

EJS Equinox Precession model was created using the Easy Java Simulations (EJS) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.   Double clicking the ejs_astronomy_EquinoxPrecession.jar file will run the program if  Java is installed.  EJS is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models.  Additional EJS models for astronomy are available.  They can be found by searching ComPADRE for  Open Source Physics, OSP, or EJS.

Please note that this resource requires at least version 1.5 of Java (JRE).
View the source code document attached to this resource
Subjects Levels Resource Types
Astronomy
- Astronomy Education
= Curricula
- Fundamentals
= Night Sky
- Historical Astronomy
= History of Astronomy
- Lower Undergraduate
- Middle School
- High School
- Instructional Material
= Curriculum support
= Interactive Simulation
Intended Users Formats Ratings
- Educators
- Learners
- General Publics
- application/java
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Access Rights:
Free access
License:
This material is released under a Creative Commons Attribution 3.0 license.
Rights Holder:
Todd Timberlake
Keywords:
EJS, Earth, Easy Java Simulations, OSP, Open Source Physics, Sun, celestial globe, celestial sphere, precession
Record Cloner:
Metadata instance created August 26, 2009 by Mario Belloni
Record Updated:
June 13, 2014 by Andreu Glasmann
Last Update
when Cataloged:
August 18, 2009
Other Collections:

ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
T. Timberlake, Computer Program EQUINOX PRECESSION MODEL, Version 1.0 (2009), WWW Document, (http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9388&DocID=1295).
AJP/PRST-PER
T. Timberlake, Computer Program EQUINOX PRECESSION MODEL, Version 1.0 (2009), <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9388&DocID=1295>.
APA Format
Timberlake, T. (2009). Equinox Precession Model (Version 1.0) [Computer software]. Retrieved October 25, 2014, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9388&DocID=1295
Chicago Format
Timberlake, Todd. "Equinox Precession Model." Version 1.0. http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9388&DocID=1295 (accessed 25 October 2014).
MLA Format
Timberlake, Todd. Equinox Precession Model. Vers. 1.0. Computer software. 2009. Java (JRE) 1.5. 25 Oct. 2014 <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9388&DocID=1295>.
BibTeX Export Format
@misc{ Author = "Todd Timberlake", Title = {Equinox Precession Model}, Month = {August}, Year = {2009} }
Refer Export Format

%A Todd Timberlake
%T Equinox Precession Model
%D August 18, 2009
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9388&DocID=1295
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Timberlake, Todd
%D August 18, 2009
%T Equinox Precession Model
%7 1.0
%8 August 18, 2009
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9388&DocID=1295


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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The AJP/PRST-PER presented is based on the AIP Style with the addition of journal article titles and conference proceeding article titles.

The APA Style presented is based on information from APA Style.org: Electronic References.

The Chicago Style presented is based on information from Examples of Chicago-Style Documentation.

The MLA Style presented is based on information from the MLA FAQ.

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Equinox Precession Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Equinox Precession Model.

relation by Mario Belloni

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