Astronomical Java Applets and Animations

Together with Tey Meng Khoon and Frederick H. Willeboordse of CITA (Centre for Information Technology and Applications), I have developed interactive Java applets that I hope will help you understand the motion of the Earth, the Sun and the Moon.

You will notice that a lot of the applets are somewhat similar. They show the same thing, but we're trying to emphasis different aspects or points of view in each one.

• The Motion of the Earth Around the Sun
• The Apparent Motion of the Sun
• The Apparent Motion of the Sun at Different Latitudes
• The Apparent Motion of the Sun at Different Times of the Year
• The Motion of the Sun Along the Ecliptic
• A Vertical Sundial
• The Astrological Houses at Different Latitudes
• A simplified model of the tilt of the waxing or waning Moon in different parts of the world
• What does the waxing or waning Moon look like in different parts of the world in the course of the year?

For more info, please see my web page Heavenly Mathematics: Highlights of Cultural Astronomy.