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The axis has an angle of 23 1 / 2∘ and is perpendicular to the plane of Earth’s orbit. This means, Earth is tilted on its axis, and because of this tilt, the northern and southern hemispheres lean in a direction away from the Sun. The rotation of the Earth divides it into a lit-up half and a dark half, which gives rise to day and night. Through models, investigations, graphing, and computer simulations, students learn that Earth revolves around the sun in a year’s time, and rotates on its axis once approximately every 24 hours. They make connections between the rotation of the earth and day/night, and the apparent movement of the sun, moon, and stars across the sky, as well ... May 17, 2020 · And we can accredit these long-term climate changes to 3 variations in geometry between the Earth and sun: ECCENTRICITY: How the Earth orbits the sun. OBLIQUITY: What angle Earth faces the sun. PRECESSION: How Earth’s axis of rotation changes. If you put these 3 interactions of Earth and the sun together, they form the Milankovitch Cycle.