A solar eclipse occurs only when the Moon is in the New Moon phase and perfectly aligned at a 0.0° angle to the Earth-Sun plane. Setting the Alignment

If you're referring to an educational resource like Gizmos from ExploreLearning, these are interactive simulations that help students learn complex scientific concepts. For an activity or simulation on 3D eclipses, here are some general steps and concepts that might be covered:

: The darkest, central part of the shadow where the Sun is completely blocked.