Students can discover patterns in weather during the year by keeping a journal. Younger students can draw a daily weather picture based on what they see outside. Older students can keep simple charts and graphs from data they collect at a school weather station. Emphasis in grades K-4 should be on developing observation and description skills. Younger children should be encouraged to talk about and draw what they see and think.
Older students can keep journals, use instruments, and record their observations and measurements.
A straight line joining a planet and the sun sweeps out equal areas in equal times. In simple terms, the speed of a planet is the largest when it is nearest to the Sun, and smallest when it is the farthest from the Sun. In simple terms, the closer a planet is to the sun, the more quickly it makes a complete orbit. Newton proposed that a planet travels in an orbit about the sun because the sun exerts a force of gravitational attraction on it. He showed that all three of Kepler's laws follow mathematically from his single Law of Universal Gravitation.