The EJS Phases of Moon model displays the appearance of Moon and how it changes depending on the position of Moon relative to Earth and Sun. The main window shows Earth (at the center) and Moon, as well as a circle tracing out Moon's orbit. Sun is far to the right in this picture and therefore the right side of Earth and Moon are bright while the left sides are dark. By using the Options Menu the Moon View window shows the appearance of Moon as seen from Earth when Moon is in the position shown in the main window. 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.
The EJS Phases of Moon model includes three supplemental documents (see below) that include a middle school lesson plan, a college level worksheet, and the student version of the program.
EJS Phases of Moon 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_MoonPhases.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
Moon Phases Model for Teachers
A customizable Moon Phases Model that allows teachers to set the display parameters. The customized simulation is automatically saved with associated curricular in a new jar file that can be redistributed. download 1250kb .jar
Last Modified: July 23, 2012
Phases of Moon Model: Student Version
EJS Phases of Moon Model: Student Version is a simulation for college students. It is distributed as a ready-to-run (compiled) Java archive and has the exploration pdf built-in. Double clicking the ejs_MoonPhasesStudent.jar file will run the program if Java is installed. download 1444kb .jar
Published: October 12, 2009
Phases of Moon Model: Homework Exploration
A pdf file with a college-level homework exploration for use with the Phases of Moon: Student Model. download 206kb .pdf
Published: October 12, 2009
Phases of the Moon Model: Middle School Version EJS Phases of Moon Model: Middle School Version is a simulation for middle school and high school students. It is distributed as a ready-to-run (compiled) Java archive and has the exploration/lesson plan pdf built-in. Double clicking the …
EJS Phases of Moon Model: Middle School Version is a simulation for middle school and high school students. It is distributed as a ready-to-run (compiled) Java archive and has the exploration/lesson plan pdf built-in. Double clicking the ejs_MoonPhasesMiddleSchoolStudent.jar file will run the program if Java is installed.
Moon Phase Answer Simulation by Lookang Lawrence Wee
This simulation helps provide context for the answers to the moon phase exploration assignments. The simulation adds a local time grid as well as showing the current view of the Moon an observer would see if it is above the observer's horizon. download 1998kb .jar
Published: February 16, 2012
Rights: original simulation by Todd Timberlake; additional material by Lookang Lawrence Wee.
Phases of Moon Model Source Code
The source code zip archive contains an XML representation of the Ejs Phases of Moon Model. Unzip this archive in your Ejs workspace to compile and run this model using Ejs. download 78kb .zip
Published: July 31, 2009
Moon Phases for Teachers Source Code
Source Code for the Moon Phases Model for Teachers. The source code archive contains an XML representation of the EJS model. Unzip this archive in your EJS Workspace to compile and run this model using Ejs. download 221kb .zip
Last Modified: July 23, 2012
K-2: 4A/P2. The sun can be seen only in the daytime, but the moon can be seen sometimes at night and sometimes during the day. The sun, moon, and stars all appear to move slowly across the sky.
K-2: 4A/P3. The moon looks a little different every day but looks the same again about every four weeks.
4B. The Earth
6-8: 4B/M5. The moon's orbit around the earth once in about 28 days changes what part of the moon is lighted by the sun and how much of that part can be seen from the earth- the phases of the moon.
11. Common Themes
6-8: 11B/M1. Models are often used to think about processes that happen too slowly, too quickly, or on too small a scale to observe directly. They are also used for processes that are too vast, too complex, or too dangerous to study.
NSES Content Standards
Con.D: Earth & Space Science
K-4: Objects in the Sky
K-4: Changes in Earth & Sky
NSES Professional Development Standards
PD.A: Learn Science Content through Inquiry
Active Investigation: Involve teachers in actively investigating phenomena that can be studied scientifically, interpreting results, and making sense of findings consistent with currently accepted scientific understanding.
%0 Computer Program %A Timberlake, Todd %D July 31, 2009 %T Phases of Moon Model %7 1.0 %8 July 31, 2009 %U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9308&DocID=1247
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This is an inquiry-based tutorial for grades 6-9 on the topic of moon phases. Students work with partially-competed diagrams to understand how the Earth's rotation, moon's orbit around Earth, and reflected sunlight all come together to produce a "changing" moon.
This is a remix based on this applet. Changes made are: 1. Added earth png from Wikipedia 2. Used gimp to make the background transparent 3. Made the moon png background transparent 4. Redesigned the buttons controls slider to the bottom 5. Color scheme the background of button, etc. 6. Added earth-moon line for visualization and aiding the recording the overhead time for each day. refer to worksheet from osp 7. Added day field for visualization the day the various phases occurs if the new moon is day 0 8. Added text for phases of moon 9. Added yellow text to make applet more quickly contextualized Earth view of the Moon and the Orbit view of the moon 10. Added day and night model of the background of the earth view of the moon 11. Added blind spot model where observer cannot see the moon 12. Added color associated green=can see moon from observer location, red=cannot see 13. Added reset button 14. Added hints to all checkbox buttons slider etc, for just in time help