Happy March Equinox Everyone!
Humankind’s imagination is as vast as the solar system we live in! Out of our imagination comes tools for working, farming, and building. If we let our imaginations soar we become inventors. In fact, inventive thinking and problem solving is something we do everyday. We see a problem and come up with a solution. In the Oak Meadow 5th grade science curriculum, students study technology and design and work on their own inventions. It’s so much fun to see what they imagine and bring into the world! They construct things that help with a job around the house, create toys for pets, and design many other practical and useful items. Humankind just seems to long for answers to questions!
Long ago astronomers sought answers to the many questions about the universe. When an answer wasn’t in sight, they imagined and created stories or guidelines for their lives. They imagined stories about the stars they saw in the night sky, imagined the sun went to sleep each night, and imagined the world was flat. In future years we have come to understand more about the universe through observation. In observing the rising and setting of the sun, astronomers imagined a great dome over the Earth’s sky and called it the celestial sphere. They imagined the celestial equator as being in the middle of the north and south poles and right above the Earth’s equator.
During the March equinox, when we have twelve hours of daylight and twelve hours of darkness, “the sun crosses the celestial equator, to enter the sky’s Northern Hemisphere. No matter where you are on Earth (except the North and South Poles), you have a due east and due west point on your horizon. That point marks the intersection of your horizon with the celestial equator, the imaginary line above the true equator of the Earth. And that’s why the sun rises due east and sets due west, for all of us, at the equinox. The equinox sun is on the celestial equator. No matter where you are on Earth, the celestial equator crosses your horizon at due east or due west.”
So get outside on March 20th and find due east and due west in your environment! It’s the first day of spring!