# A.J.J.A.R.

## Astronomical Javascript, Java Applet Resources

This website is set up as a resource for instructors of astronomy at all levels.  Items are presented in a variety of formats and levels of complexity, so that instructors at all levels from K-12 to college level could make use of the programs here.  All items on this site are free to use and copy.  We ask that they stay that way - free.  If you find a way to enhance or improve any of the items here, we ask that you share that information with us.

### Solar Motions

• Motion of the Sun - see how the path of the sun in various directions, for various times of the year from various latitudes.  Doesn't work well for latitudes near the equator when looking in certain directions. Sees objects upto 100 degrees above horizon (though only plots upto 90 degrees).
• Motion of the Sun/Zenith view - similar to above, but allows an all-sky view (zenith) and has limited altitude views (sees objects upto 60 degrees above horizon)
• Seasons Demo -  input your latitude, date, see where the sun is in the sky, can what part of the Earth is the Sun is directly above.
• Seasons Demo - same as above, but with graphic showing the Earth's tilt toward/away from the Sun.

### Gravity

• Newton's Cannon - watch what happens when a projectile is (possibly) sent into orbit.
• Getting to another planet - use the gravity of the Sun to go to another planet.
• Getting to another planet - same as above, but with javascript (so no animation)...
• Crater Impact -  hit the Earth, the Moon or Mars with some objects
• Crater Impact on Google Maps - similar to above, but uses Google Maps
• Gravity - input your weight and find out how much you would weigh on other planets.
• Gravity - input your weight, and the mass & radius of a planet (in terms of the Earth's) to see how much you would weigh and how much the gravity is.
• Gravity (Graphical Version) - same as above, but showing a squashed person under high gravity conditions.
• Gravity (Graphical Version) - same as above, input weight, planet mass and radius, see how flat you become.
• Jumping - input how high you can vertically jump on the Earth and see how high you would be able to jump on other planets
• Jumping - input how high you can jump, planet mass, planet radius and see how high you jump on other worlds.
• Jumping (Graphical Version) - same as above, but graphically illustrating how high a person would jump on planets in the solar system.
• Jumping (Graphical Version) - same as above, input in planet mass and radius along with Earth jumping height.
• Escape Velocity - determines the escape velocity for planets of different masses and radii.
• Escape Velocity (Graphical Version) - input a velocity to see if you can escape from the planet - can also change the planet's mass/radius.  An excessive velocity will not work since you'll run out of fuel.

### Star Charts

If you have any comments or suggestions, please send them to  me