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written by Mario Belloni and Todd Timberlake
The Equatorial Coordinates model displays the position of a star in equatorial (Right Ascension/Declination --- RA/Dec) coordinates. The horizon is shown along with the four cardinal directions (N, E, S, and W). The Latitude slider changes the latitude of the observer which is shown by the change in the (teal) celestial pole relative to the northern horizon. The position of the star can be changed by using the Right Ascension and Declination sliders. Once these coordinates are selected, pressing the play button will put the star, celestial grid, and the equatorial coordinates in motion to simulate the 23 hour and 56 minute motion of stars in the night sky.

Equatorial Coordinates model is distributed as a ready-to-run (compiled) Java archive.  Double clicking the ejs_astronomy_EquatorialCoordinates.jar file will run the program if Java is installed.  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.

Please note that this resource requires at least version 1.5 of Java (JRE).
Subjects Levels Resource Types
Astronomy
- Astronomy Education
= Curricula
- Fundamentals
= Night Sky
- Lower Undergraduate
- High School
- Upper Undergraduate
- Instructional Material
= Curriculum support
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
  • Currently 3.0/5

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Access Rights: Free access
License: This material is released under a GNU General Public License Version 3 license.
Rights Holder: Mario Belloni and Todd Timberlake
Keywords: EJS, Easy Java Simulations, OSP, Open Source Physics, astronomy, coordinates, equatorial, night sky
Record Creator: Metadata instance created November 14, 2009 by Mario Belloni
Record Updated: Jun 06, 2014 by Andreu Glasmann
Last Update
when Cataloged:
November 14, 2009
Other Collections:
ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
M. Belloni and T. Timberlake, Computer Program EQUATORIAL COORDINATES MODEL, Version 1.0 (2009), WWW Document, (http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9643&DocID=1417).
AJP/PRST-PER
M. Belloni and T. Timberlake, Computer Program EQUATORIAL COORDINATES MODEL, Version 1.0 (2009), <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9643&DocID=1417>.
APA Format
Belloni, M., & Timberlake, T. (2009). Equatorial Coordinates Model (Version 1.0) [Computer software]. Retrieved November 27, 2014, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9643&DocID=1417
Chicago Format
Belloni, Mario, and Todd Timberlake. "Equatorial Coordinates Model." Version 1.0. http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9643&DocID=1417 (accessed 27 November 2014).
MLA Format
Belloni, Mario, and Todd Timberlake. Equatorial Coordinates Model. Vers. 1.0. Computer software. 2009. Java (JRE) 1.5. 27 Nov. 2014 <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9643&DocID=1417>.
BibTeX Export Format
@misc{ Author = "Mario Belloni and Todd Timberlake", Title = {Equatorial Coordinates Model}, Month = {November}, Year = {2009} }
Refer Export Format

%A Mario Belloni
%A Todd Timberlake
%T Equatorial Coordinates Model
%D November 14, 2009
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9643&DocID=1417
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Belloni, Mario
%A Timberlake, Todd
%D November 14, 2009
%T Equatorial Coordinates Model
%7 1.0
%8 November 14, 2009
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9643&DocID=1417


Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.

Citation Source Information

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

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.

Equatorial Coordinates 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 Equatorial Coordinates Model.

relation by Mario Belloni
Covers the Same Topic As Local Coordinates Model

The Local Coordinates model displays the position of a star in local (Altitude/Azimuth) coordinates.

relation by Mario Belloni

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