Nicolaus Copernicus developed the theory of Earth's orbit around the sun demonstrated in this science simulation.

An equation for the law of universal gravitation is stated. The weight equation (W=m*g) is related to the law. An interactive JavaScript form allows the user to practice determining the force of gravity and the acceleration of gravity...

Students perform many inquiry activities related to Earth's orbit. Included are recording daily temperatures, observing the sun's path over several weeks, tracking sunrise and sunset times, and angle of sunlight. Diagrams make lessons...

Learn about how Earth orbits the sun and how satellites orbit the Earth. Discover the different types of satellites such as GOES and POES and what they are used to monitor.

A discussion and statement of an equation for orbital speed. An interactive JavaScript form allows the user to investigate the relationship between orbital height and orbital speed. A very good opportunity to practice and receive...

Students will use this applet to form and test hypothesis of what the orbit of Mars will look like relative to Earth. [Requires Java.]

[Free Registration/Login Required] An interactive animation demonstrating the Earth's tilted axis and how that causes the seasons. Also included on the site is a short quiz on the topic.

Excellent Eight Planets site that provides a vast amount of information about planet Earth. Very comprehensive and complete site.

[Free Registration/Login may be required to access all resource tools.] Discusses the motion of the Earth with its day and night cycle, the seasons, the Earth's orbit around the Sun, and its year-long cycle.

The BBC provides a general overview of the planet Earth. Content includes statistical information, a focus on the four seasons, moon information, and more.

Describe the movement of earth and the moon.

This interactive activity from the Adler Planetarium explains the "reasons for the seasons." Featured is a game in which Earth must be properly placed in its orbit in order to send Max, the host, to different parts of the world during...

Learn about the different satellites that are probing the solar system on the website. Also included is a video that explores Astrobiology.

Experience a science simulation illustrating the Copernican theory of Earth's orbit around the sun.

Lesson plan addresses misconceptions about seasonal changes and Earth's orbit through a pre-lesson survey and follow-up experiments to scientifically study the answers to questions found in the survey. Includes great teacher background...

The Swiss Propulsion Laboratory is a non-profit organization whose primary goal is the development of means of lifting civilian payloads into low-earth orbit at reasonable prices.

Why do some regions experience full-time heat while others are reckoning with frigid temperatures and snow? And why are the seasons reversed in the two hemispheres? Rebecca Kaplan explains how the shape of the Earth's orbit around the...

A video and a short multiple-choice quiz on how the Earth's tilt on its axis, its rotation, and its orbit around the Sun give us a 24-hour day, a 365-day year, and our seasons.

Move the sun, earth, moon, and space station to see how it affects their gravitational forces and orbital paths. Visualize the sizes and distances between different heavenly bodies, and turn off gravity to see what would happen without it.

An interactive simulation that teaches about gravitational force, circular motion, and astronomy by manipulating the sun, earth, moon, and a space station to observe the effects of gravity and orbital paths. This simulation can either be...

Experience a simulation of ballistic trajectories in relationship to Earth's orbit. Java 1.5 or more recent is required.

Presents an informative answer to the question "What is the speed of the turning of the Earth?"

Facts about the Earth including its orbit, its atmosphere, and its landforms. Includes a discussion question on seasons, with facts about them, and the answer. A linked page covers similar material in a "Level 2" version, and has a...

Help Sarah Jane and her team put the solar system's planets back in order. Following the activity, read more about the sun, the Earth, and its moon, and then take a quick quiz to check for understanding.