Seasons
The Earth orbits the Sun once every 364.25 days. Every 4 years we have a leap year, where we add an additional day in February to make it up.
The images in this video are not drawn to scale, because to do so, we couldn't see the Earth and Sun in the same image. The Sun is actually 109 times greater in width (diameter) than the Earth. That means that when they were drawn next to each other, the Earth would be 1/109th the height of the Sun. We wouldn't see it on the screen.
The distance between the Earth and the Sun is actually about 23,400 times the Earth's diameter. That means that when drawn next to each other as shown in the top image of the video, the Earth would actually appear smaller than a pin hole (you'd need to line up 23,400 of them next to each other to reach the Sun).
Earth rotates around its own axis once every 23 hours and 56 minutes. It takes another 4 minutes more rotation to face the Sun again. So when we talk about a day = 24 hours, we are really saying the time it takes to return us to facing the Sun. (Technically called a "solar day.") Multiply 4 minutes per day by 1/2 a year and you get about 12 hours. By the time we get to the other side of Earth's orbit, we are about 12 hours rotated from where we were on the other side. The result is that noon always ends up with us almost directly under the Sun depending on where you live in a time zone. We don't notice this 12-hour rotation unless we look at the stars in the sky (the "fixed objects" against which we can see our motion). That's why we see different constellations at night depending on the time of the year.
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