APS Excellence in Physics Education Award
November 2019

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Science SPORE Prize
November 2011

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The Open Source Physics Project is supported by NSF DUE-0442581.

Computer Program Detail Page

Item Picture
Lunar Month JS Model
written by Todd Timberlake and Mario Belloni
The EJS Lunar Month JS model displays the appearance of the Moon over the course of the lunar (synodic) month. The window shows the appearance of the Moon as seen from Earth as well as the current number of days into the lunar month and the current Moon phase.  

The EJS Lunar Month JS model was developed using the Easy Java/JavaScript Simulations (EjsS) version 5.  It is distributed as a ready-to-run html page and requires only a browser with JavaScript support.  This model runs on tablets.
1 source code document is available
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
- Educators
- Learners
- General Publics
- application/javascript
  • Currently 0.0/5

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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 March 4, 2015 by Mario Belloni
Record Updated:
June 15, 2015 by Lyle Barbato
Last Update
when Cataloged:
March 4, 2015
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 LUNAR MONTH JS MODEL, Version 1.0 (2015), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13417&DocID=4003).
T. Timberlake and M. Belloni, Computer Program LUNAR MONTH JS MODEL, Version 1.0 (2015), <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13417&DocID=4003>.
APA Format
Timberlake, T., & Belloni, M. (2015). Lunar Month JS Model (Version 1.0) [Computer software]. Retrieved July 15, 2024, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13417&DocID=4003
Chicago Format
Timberlake, Todd, and Mario Belloni. "Lunar Month JS Model." Version 1.0. https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13417&DocID=4003 (accessed 15 July 2024).
MLA Format
Timberlake, Todd, and Mario Belloni. Lunar Month JS Model. Vers. 1.0. Computer software. 2015. 15 July 2024 <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13417&DocID=4003>.
BibTeX Export Format
@misc{ Author = "Todd Timberlake and Mario Belloni", Title = {Lunar Month JS Model}, Month = {March}, Year = {2015} }
Refer Export Format

%A Todd Timberlake %A Mario Belloni %T Lunar Month JS Model %D March 4, 2015 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13417&DocID=4003 %O 1.0 %O application/javascript

EndNote Export Format

%0 Computer Program %A Timberlake, Todd %A Belloni, Mario %D March 4, 2015 %T Lunar Month JS Model %7 1.0 %8 March 4, 2015 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=13417&DocID=4003

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.

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Lunar Month JS Model:

Supplements Phases of the Moon JS Model

The Lunar Month JS Model shows the phases of the Moon without showing their cause.  The Phases of the Moon JS Model shows the Earth, Moon, and Sun and how the phases are created by the orientation of the Sun, Moon, and Earth.

relation by Mario Belloni
Is Based On Easy Java Simulations Modeling and Authoring Tool

Use the Easy Java Simulations Modeling and Authoring Tool to edit and to explore the source code for the Lunar Month JS Model.

relation by Lyle Barbato

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