Astronomy... (continued,
see also
Planets.
Pleiades.
Plurality of worlds.
Frojectile forces.
Froper motions.
Pyremids of Ghizeh.
Refraction.
Polar motion.
(continued)
4).
Right ascension. Seturn.
Solar system.
Space, Celestial. Spectroscope. Spectrum, Stellar. Spectrum analysis. Spherical astronomy.