PQ parallax - The apparent motion of an object due to the observer’s motion.  Nearby stars show an annual parallax, But the magnitude of the motion is exceedingly small due to the great distances to even the nearest stars. parsec - contraction of parallax-second)  A unit of distance in astronomy.  A star one parsec away would seem to shift back and forth by one second of arc as we orbit our Sun each year. perigee - the point of closest approach of an object orbiting the Earth in an elliptical orbit. perihelion - The point in a planet’s orbit around the Sun where that planet is closest to the Sun.  It’s orbital speed is greatest here.
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Glossary
Carpe Caelum