=Rise.= To come into sight above the horizon, as the Moon rises. =Rotate.= To turn completely round on an axis like a top or the Earth. =Rotary.= Turning completely round on an axis, like a top or the Earth. =Roughly.= Not exactly; nearly enough for practical purposes. =Schedule.= (1) A tabulated statement giving items concerning a subject. (2) A timetable of any kind. =Seeing.= To look at. The word _seeing_ in starcraft means to observe the stars. _Good seeing_ is to observe the stars when the atmosphere is perfectly clear. =Seems.= Something which apparently is true and yet is not necessarily true. =Sensation.= The action of one of the senses when excited by some change in matter. Light falling on the retina of the eye produces the sensation of light and color in the brain. =Set.= To sink from sight below the horizon; as the Sun sets. =Sight.= The power to see. See Sighting. =Sighting.= To get the eye and two other objects, such as a telescope and a star, in a line, as to sight Jupiter with a telescope. =Sign.= A mark, figure or letter which astronomers have agreed to use to represent certain stars, aspects of stars, parts of the zodiac, etc. =Solar.= That which is of, or has to do with the Sun. =Spring stars.= The stars which can be seen best during the spring months. =Star chart.= A map of the positions of the stars. =Starcraft.= Useful knowledge of the stars. Skill shown in making the stars serve useful purposes. =Star finder.= A device of any kind which will enable an unskilled person to find the planets or constellations. =Star-lore.= Learning concerning the mythology of the stars. =Summer stars.= The stars which can best be seen during the summer months. =Supposition.= See Idea. =Tangent.= See Appendix B. =Tangent line.= See Appendix B. =Telegraph code.= The alphabet of dots and dashes. =Test.= To try out. To examine, compare or make an experiment which will give a needed proof. =Theory.= See Idea. =Thumb tack.= A short, thin, sharp-pointed tack with a large flat head which permits it to be easily pushed into a board with the thumb. It is used by draftsmen for fastening paper to drawing boards. =Tilting.= Leaning from a vertical or plumb line. The axis of the Earth is tilted from the perpendicular 23½ degrees; this throws its equator out of plane with that of the sun, and the circle through the Earth that is in plane with the Sun is called the ecliptic. =Transparent.= Said of any substance through which light can pass easily. Anything that may be seen through.