The Astronomy Center has provided educational resources to introductory astronomy educators since 2003. Over the past 20 years, the rapid pace of discovery has rendered some of our linked resources obsolete. Thus, the Astronomy Center will be decommissioned on March 1, 2022. Our highest quality resources will be retained on


home - login - register - about - sitemap
advanced search

Computer Program Detail Page

Item Picture
Phases of Venus Model
written by Todd Timberlake
The EJS Venus Phases model illustrates the phases of Venus as predicted by either the Copernican system of the Ptolemaic system (the Copernican system is the default). One window shows Earth, Sun, and Venus on its Copernican orbit. Venus is shown as a disk with the side facing the sun colored yellow (since it reflects the sun's light) and the other side colored dark gray (since that side is dark). Playing the simulation puts all moving objects (Venus and Earth/Sun) in motion. Another window shows what Venus would look at this position, when viewed from Earth through a telescope. A menu option displays another window showing Galileo's drawings of his telescope observations of Venus.  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 Phases of Venus 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_VenusPhases.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).
1 source code document is available
Subjects Levels Resource Types
- Astronomy Education
= Curricula
- Fundamentals
= Lunar Phases
- Solar System
= Earth
= Venus
- Lower Undergraduate
- Middle School
- High School
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Educators
- Learners
- General Publics
- application/java
  • Currently 0.0/5

Want to rate this material?
Login here!

Access Rights:
Free access
This material is released under a Creative Commons Attribution 3.0 license.
Rights Holder:
Todd Timberlake
EJS, Easy Java Simulations, OSP, Open Source Physics, Venus, phase, phases
Record Cloner:
Metadata instance created August 18, 2009 by Mario Belloni
Record Updated:
December 2, 2021 by Lyle Barbato
Last Update
when Cataloged:
August 18, 2009
Other Collections:

ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
T. Timberlake, Computer Program PHASES OF VENUS MODEL, Version 1.0 (2009), WWW Document, (
T. Timberlake, Computer Program PHASES OF VENUS MODEL, Version 1.0 (2009), <>.
APA Format
Timberlake, T. (2009). Phases of Venus Model (Version 1.0) [Computer software]. Retrieved June 22, 2024, from
Chicago Format
Timberlake, Todd. "Phases of Venus Model." Version 1.0. (accessed 22 June 2024).
MLA Format
Timberlake, Todd. Phases of Venus Model. Vers. 1.0. Computer software. 2009. Java (JRE) 1.5. 22 June 2024 <>.
BibTeX Export Format
@misc{ Author = "Todd Timberlake", Title = {Phases of Venus Model}, Month = {August}, Year = {2009} }
Refer Export Format

%A Todd Timberlake %T Phases of Venus Model %D August 18, 2009 %U %O 1.0 %O application/java

EndNote Export Format

%0 Computer Program %A Timberlake, Todd %D August 18, 2009 %T Phases of Venus Model %7 1.0 %8 August 18, 2009 %U

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 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.

This resource is stored in 6 shared folders.

You must login to access shared folders.

Phases of Venus 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 EJS Phases of Venus Model.

relation by Mario Belloni

Know of another related resource? Login to relate this resource to it.
Save to my folders



Related Materials

Similar Materials