This is a book about seasons. Learners will read or listen to a story about two twins, Matt and Matilda, who are tasked with creating a model of the Earth-Sun system for a science fair project. Through some wild seasonal changes they experience... (View More) while creating the model, the two come to a better understanding of the causes of Earth's seasons. An extension activity is included (Reasons for the Seasons), as well as reading and vocabulary activities. (View Less)

In this activity, learners draw a circle with a single focus, an ellipse with two foci close together, and an ellipse with two foci far apart, and compare the shapes. Learners then measure the Sun in four images each taken in a different season,... (View More) comparing the apparent size of the Sun in each image to determine when Earth is closest to the Sun. This is the second activity in the SDO Secondary Learning Unit. The activity is reprinted with permission from the Great Explorations in Math and Science (GEMS). (View Less)

This is an activity about the motion of the Earth around the Sun. Learners will act out the motions of Earth as it orbits around the Sun over the course of one year, starting with modeling one day, then one year, and finally the months.

In this kinesthetic activity, learners act out the rotation and revolution motions of Earth around the Sun over the course of one year. Learners also physically model the tilt of the Earth and will identify the summer and winter solstice and vernal... (View More) and autumnal equinox locations in relation to Earth's orbit around the Sun. (View Less)

This is an activity about seasons. Learners begin by brainstorming a list of activities and events that occur in each season. Next, learners perform an experiment by comparing the temperature on thermometers left under a lamp for different lengths... (View More) of time to illustrate that Earth heats more when the Sun is in the sky longer. (View Less)

In this hands-on activity, learners begin by estimating the size of each planet in our Solar System and Pluto and making each out of playdough or a similar material. Then, learners follow specific instructions to divide a mass of playdough into the... (View More) size of each planet and Pluto and compare the actual modeled sizes to the students' own predictions. This activity requires a large amount of playdough material per group of learners. Three pounds is the minimum amount required for each group. (View Less)

This is an activity about the relation between day length and temperature. In one team, learners will create and analyze a graph of hours of sunlight versus month of the year for a number of latitudes. In another team, learners will graph... (View More) temperature versus month for the same latitudes. The teams then compare data and draw conclusions from their analyses. (View Less)

This is an activity about the concept of direct versus indirect sunlight. Learners construct and use a sun angle analyzer to investigate the effect of angle on area illuminated. The fraction of light on each square of the analyzer is then calculated... (View More) and compared. A discussion at the end relates the results to the amount of sunlight falling on different parts of the Earth and the effect this has on temperature and seasons. Reprinted with permission from the Great Explorations in Math and Science (GEMS). (View Less)

The images and information in the slide show presentation are designed to give learners a better understanding of how ancient cultures observed and interpreted the apparent motions of the Sun in the sky, as well as modern studies of the Sun using... (View More) telescopes and spacecraft. It was originally designed to accompany a previous NASA-funded educational program, entitled The Sun in Time. (View Less)