Planet
2 of the 7 encyclopedias on this shelf carry an entry for Planet. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
a heavenly body which, to old-world observers, seemed to wander about aimlessly in the sky, thus markedly contrasting with the orderly movements of the fixed stars. Subsequently it was discovered that the seemingly erratic bodies were as regular in their movements as the others, revolving, like the earth, around the sun. Planets are primary or secondary, the former revolving around the sun, the latter around the primaries. The primary planets known to the ancients were five: Mercury, Venus, Mars, Jupiter, and Saturn. Omitting asteroids, comets, and meteoric rings, eight are now known. Mercury, Venus, the Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Twenty-one secondary planets are known, the Moon, two satellites of Mars, five of Jupiter, eight of Saturn, four of Uranus, and one of Neptune. The planets Mercury and Venus, being nearer than the Earth to the Sun, are called inferior planets; the others hers,, being more distant, are termed superior. Another classification is sometimes adopted, that into intraand extra - asteroidal planets; that is, those nearer and those more remote from the sun than the asteroids. Under the first are included, Mercury, Venus, the Earth, and Mars, all of which are comparatively small, while the others, Jupiter, Saturn, Uranus,.and Neptune, are the giants of the system. For instance, the Earth is 7,918 miles in diameter, and Mars 4,200, but Jupiter is 85,- 000. The intra-asteroidal planets complete the annual revolution in short periods, the Earth, for example, in 365.26 days, while Neptune takes to do so 60,127 days, or about 165 years. The minor planets, planetoids, or asteroids are between Mars and Jupiter.
An Encyclopaedia of Occultism (1920)
(See Planetary Chains.) 66 66 Planetary Logos , or Ruler of Seven Chains, is, in the theosophic scheme, one of the grades in the hierarchy which assists in the work of creation and guidance. It is the supreme Logos who initiates this work, but in it he is helped by the seven." They receive from him the inspiration and straightway each in his own Planetary Chain carries on the work, directed by him no doubt, yet in an individual fashion, through all the successive stages which go to compose a Scheme of Evolution. (See Logos, Chains.)