ASTR 101 1st Edition Lecture 3 Outline of Last Lecture I. The Universe,II. Scale of the solar system,III. Cosmic calendarOutline of Current Lecture I. Patterns in the Night SkyII. The four aspects of cosmology III. Constellations and planesCurrent Lecture—Volcanoes 1I. Patterns in the Night Skya. The ecliptic is: the path to the sun on the celestial sphere and the projection of Earth’s orbit onto the celestial sphereb. The meridian is: the boundary between Eastern and Western halves of your local skyc. The North celestial or South celestial poles do not move on the celestial sphere over the course of a day.II. The four aspects of cosmology 1. Motion of the planet Earth2. Seasons3. Lunar and solar eclipses4. Planet in motionIII. Constellations and planesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.a. Constellations sort of map out the sky; there are 88 official constellations.b. Celestial sphere= stars look like they’re on the same sphere but could be far apart and are various differences from the Earthc. Galactic plane contains our milky way.d. Local sky: objects altitude (above the horizon) and direction(along the horizon) specify its location on your local skye. We measure the sky using angles. Since degrees of sun and moon are so close, they sometimes cross each other! f. Angular size is inversely proportional to distance and directly proportional to physical sizeg. They sky varies with both latitude and longitude… you see a difference locally because of the time changeh. Altitude of the celestial pole = your latitudei. The North Star (AKA Polaris) is 50 degrees above your horizon due North. Whereare you? At latitude 50 degrees North.j. At midnight, the stars on our horizon are opposite the sun in the skyk. The sidereal day is about 4 minutes shorter than the traditional solar