We are not completely done with eclipses yet! Our last eclipse activity is a short one, and easy to make. It is calculated that the earth will experience a total number of 11,898 solar eclipses between 2000 BCE and 3000 CE. Notice in the diagram how the moons shadow projected. As a result, a solar eclipse can only occur during New Moon and a lunar eclipse can. In order for this to occur, the three bodies (Sun, Moon, and Earth) have to be in a nearly perfectly straight line. Generally speaking, about 75% of the surface of the Earth can see at least some part of a lunar eclipse! A lunar eclipse is truly an eclipse for everyone! There is no need to travel to exotic locations or arrive at a precise time the long lasting lunar eclipse is a show that is usually visible right in your back yard and lasts for many hours for you to enjoy. The periodicity of solar eclipses is the interval between any two solar eclipses in succession, which will be either 1, 5, or 6 synodic months. Unlike lunar eclipses that occur only during full moons, a solar eclipse can only occur during a new moon. In general, an eclipse typically refers to the Sun being blocked by the Moon (a solar eclipse) or the Earth blocking the Sun (a lunar eclipse). But with the lunar eclipse, half the Earth is inside that giant shadow! And since the total eclipse event, from the Moon’s first contact with the Earth’s shadow until it finally passes out of the shadow completely can take 5-6 hours, even more people rotate into position to see the lunar eclipse as it wears on. Take another look at your model and ask your students: “Who can see this eclipse?” With the solar eclipse, only those people who were exactly underneath the point of the Moon’s shadow could see the total event. Unlike a total solar eclipse which lasts just a few minutes, the total lunar eclipse can last more than two hours! Ask your students: “What is being eclipsed?” In other words, what is going dark? The Moon is obviously going dark here, but how? The Moon experiences darkness as its orbital motion carries it through the Earth’s massive shadow! This shadow is large and it takes several hours for the Moon to pass completely through the Earth’s shadow. Set the model up with the Moon on its orbital ring inside the Earth’s shadow. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of the Earth, totally or partially.Such an alignment occurs approximately every six months, during the eclipse season in its new moon phase, when the Moons orbital plane is closest to the plane of the Earths orbit. It won’t take long for your students to figure out that a lunar eclipse happens when the full Moon passes through the Earth’s shadow at the node of the orbit.
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