neer the Zenith you have a bright Star in the Left Leg of An∣dromeda: From thence towards the North, you find other very eminent bright Stars in Cassiopea, Cepheus, Ursa Minor, in the Tail whereof is the Pole Star: and Draco: Hecules: where you turn back, to Lyra, Cygnus, Pegasus, the Dolphin, &c. all which, or any other, you may easily know by their Altitude a∣bove the Horizon, and the point of the Compass they bear upon.
Thus knowing some of the most eminent Fixed Stars, you may by the Figure of the rest come to the knowledge of them also. For Example, Looking towards the North North East in Heaven, you may see seven bright Stars constituted in this Figure; There∣fore looking towards the same Quarter on the Globe, you may (without taking their Altitude) see the same Stars lying in the same Figure in the hinder parts of the Great Bear; from whence you may con∣clude, that those Stars in Heaven are scitu∣ate in the hinder parts of the Asterisme called Ursa Major.
Yet nevertheless you may see some Stars of Note in Heaven, which you shall not find on the Globe, and those in or neer about the Ecliptick: They are called Planets, and cannot be placed on the Globe, unless it be for a particular Time, with Black Lead, or some such thing that may be rubbed out again: Because they having a continual motion alwaies alter their Places. Of those there are five in number, besides the Sun and Moon, which are also Planets, though they shew not like Stars. These five are called Saturn, Jupiter, Mars, Venus, Mercury; yet Mecury is very rarely seen: because he never Rising above an Hour before the Sun, or Setting above a Hour after, for the most part hath his light so overspread with the dazelling Beams of the glittering Sun, that sometimes when he is seen he seems rather to be a More in the Suns Beams, then a Body en∣dowed with so much brightness as Stars and Planets seem to be.
Now there are divers waies (by some of which you may at all times) know those Planets from the Fixed Stars: as first, Their not twinkling, for therein they differ from fixed Stars; be∣cause they most commonly do twinkle, but Planets never; unless it be ♂ Mars; and yet he twinkles but very seldom neither.
Secondly, They appear of a considerable Magnitude, as ♃