I suggested to etaoin, who is an astronmy enthusiast, that there are a lot of
interesting words to be learned about astronomy. Plato would not consider
anybody ignorant of geometry worthy of his company. Today, ignorance of
astronomy is worse. And I am ignorant of it. But I have found a place to Learn:
http://www.synapses.co.uk/astro/astro.html
Here's a small sample from glossary at the site:
Corona
Cusp
Declination
Deuteron
Doppler effect
double convex
Draconic month
ecliptic & inclination
ecliptic, ecliptic plane
epicycles
event horizon
Fraunhofer lines
Heliopause
Hertzsprung-Russell Diagram, H-R Diagram
inverse square law
Kepler's first law
Kepler's Laws of Planetary Motion
Kepler's second law
Kepler's third law
Kerr black hole
kinetic energy