ASTR 111 Chapter Notes -Semi-Major And Semi-Minor Axes, Heliocentrism, Optical Instrument
Document Summary
Circle can be divided into 360 degrees, each degree into 60 minutes of arc, and each minute into. Galileo galilei-made basic investigations into physical motions and was among the first to use a telescope for astronomical observations. Linear measure is the straight-line distance between two points. Angular measure is a measure of the difference in direction between two points as seen from a specified third point. My very energetic mother just served us noodles. The orbit must be circular enough not to cross the orbit of another planet. A planet must also have enough mass to become nearly spherical. And a planet must be able to sweep other small astronomical objects out of its orbital path. Opposition when a planet is nearer to the earth than to the sun. Conjunction- when a planet is nearer the sun than earth. Astronomical unit (au) is the average distance of the earth from the sun: 1 au = 1. 5 10 ^11 meters.
