Day 0 = New Moon, Day 7 = First Quarter, Day 15 = Full Moon, Day 22 = Last Quarter.
The Moon's apparent shape (phase) depends on how much of its sunlit face we can see from Earth — a direct result of where the Moon sits in its orbit relative to the Sun.
First Quarter — 47% of the lunar disc is illuminated (Day 7).
About this simulation
This free Phases of the Moon Interactive simulation lets students change the inputs and watch the model respond in real time. Built for earth science lessons, it runs in any browser with no signup and is ready for the projector or 1:1 devices.
What students can explore
- Adjust each control and see how it changes the phases of the moon interactive model.
- Read the live formula as your numbers are substituted in.
- Compare predictions before and after you change a value.
Is the Phases of the Moon Interactive simulation free?
Yes. This Phases of the Moon Interactive simulation is completely free, with no signup and no download required — open it in any browser.
What grades is the Phases of the Moon Interactive simulation for?
It works across grade levels — run it on a projector for younger classes, or let older students explore the controls and readouts on their own devices.
Embed this simulation
Drop it into your LMS, blog, or class site — free, no sign-up.
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