Investigates potential uses for spreadsheets that generate graphical representations, and explores complex sheets that can be used purely as demonstrations, which require far less time and expertise than writing equivalent computer programs. Includes several spreadsheet examples using Microsoft Excel. (JJK)

Describes how to fit binocular observations of the planets to a theoretical model of circular orbits using a modern computer spreadsheet, from which fundamental data about the solar system may be deduced. (AIM)

Describes how a spreadsheet is used to fit a circular orbit model to observations of Jupiter's moons made with a small telescope. Kepler's Third Law and the inverse square law of gravity are observed. (AIM)