Computer Program Detail Page

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written by Todd Timberlake and Mario Belloni
The EJS Phases of Moon JS model displays the appearance of the Moon and how it changes depending on the position of the Moon relative to Earth and Sun. The right window shows Earth (at the center) and Moon, as well as a circle tracing out Moon's orbit. The 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, the Moon View window (left) shows the appearance of the Moon as seen from Earth  when the Moon is in the position shown in the main window.  

The EJS Phases of the Moon JS model includes supplemental documents (see below) that include a middle school lesson plan.
View the supplemental documents attached to this resource (4)
View the source code document attached to this resource
Subjects Levels Resource Types
- Fundamentals
= Lunar Phases
- Solar System
= The Moon
- Lower Undergraduate
- Middle School
- High School
- Instructional Material
= Interactive Simulation
- Audio/Visual
= Image/Image Set
Intended Users Formats Ratings
- Learners
- Educators
- General Publics
- application/javascript
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Access Rights:
Free access
This material is released under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.
Rights Holder:
Todd Timberlake and Mario Belloni
EJS, EJSS, Easy Java Simulations, JavaScript, OSP, Open Source Physics, astronomy simulation, lunar, lunar phases, moon, moon phase simulation, phase
Record Cloner:
Metadata instance created July 3, 2014 by Mario Belloni
Record Updated:
December 30, 2014 by Mario Belloni
Last Update
when Cataloged:
July 3, 2014
Other Collections:

AAAS Benchmark Alignments (2008 Version)

4. The Physical Setting

4A. The Universe
  • 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

11B. Models
  • 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.
ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
T. Timberlake and M. Belloni, Computer Program PHASES OF THE MOON JS MODEL, Version 1.0 (2014), WWW Document, (
T. Timberlake and M. Belloni, Computer Program PHASES OF THE MOON JS MODEL, Version 1.0 (2014), <>.
APA Format
Timberlake, T., & Belloni, M. (2014). Phases of the Moon JS Model (Version 1.0) [Computer software]. Retrieved January 31, 2015, from
Chicago Format
Timberlake, Todd, and Mario Belloni. "Phases of the Moon JS Model." Version 1.0. (accessed 31 January 2015).
MLA Format
Timberlake, Todd, and Mario Belloni. Phases of the Moon JS Model. Vers. 1.0. Computer software. 2014. 31 Jan. 2015 <>.
BibTeX Export Format
@misc{ Author = "Todd Timberlake and Mario Belloni", Title = {Phases of the Moon JS Model}, Month = {July}, Year = {2014} }
Refer Export Format

%A Todd Timberlake
%A Mario Belloni
%T Phases of the Moon JS Model
%D July 3, 2014
%O 1.0
%O application/javascript

EndNote Export Format

%0 Computer Program
%A Timberlake, Todd
%A Belloni, Mario
%D July 3, 2014
%T Phases of the Moon JS Model
%7 1.0
%8 July 3, 2014

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

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Phases of the Moon JS Model:

Is the Basis For Earth Phases JS Model

The Phases of the Moon JS Model was modified to produce the Earth Phases JS Model.

relation by Todd Timberlake

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