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The On-Line Books Page features no
visuals, so you may want to titillate the eye a little and see what is
going on between the Earth, the Moon and the Sun. Images and live
webcasts of eclipses lunar and solar can be found at
eclipse.span.ch,
though in order to see the action your visit will have to be timed
carefully. The site gives exhaustive eclipse schedules, alongside
links to space-flight webcasts. A Space Library, co-hosted by
Nasa, JPL and Caltech at samadhi.jpl.nasa.gov,
has spectacular images, real and imagined, of planets and their moons,
spacecraft data (for the purpose of emulation), and a virtual solar
system that I found impossible to access. If this is because of
heavy traffic, as seems likely, it is a good sign. This is a
clearly designed site with a good sense of its own boundaries.
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