Given the right ascension and declination of a star,
expressed in J2000 coordinates, this demo converts those coordinates
to right ascension and declination expressed in the Earth's
equator at any given date and time. This example illustrates
how to use rotation matrices to convert one coordinate system
to another.
This example was prompted by the question at:
https://github.com/cosinekitty/astronomy/discussions/114
The npm dependencies required are now
installed locally inside the generate folder.
Cleaned up the Astronomy object closure for TS
and kept it for the Browser bundle.
We will have some usage examples in the website.
