Big Idea: The Earth is a planet orbiting the Sun - one of many stars
in our galaxy, which is one of many galaxies in the Universe. More info...
Class practical: a simple method for drawing an ellipse, using the two foci.
Demonstration: three methods of visualising elliptical orbits.
When Tycho Brahe was 17, he observed the conjunction of Jupiter and Saturn and was dismayed to find that the astronomical...
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