Mastery

• Altitude - refers to the angle between the star's position and the horizon
• Direction - is found along the horizon
• Zenith - is the point directly overhead
• Horizon - describes all points that are 90 degrees away from the zenith
• Meridian - is the great circle passing through zenith
• Great Circle - is an imaginary circle on the celestial sphere which uses the center of the Earth as its center
• Smal Circles - are tose lines of latitude, except equator
• Polaris - the axis of Earth is in line with a star
• Winter Constellations - Dec, Jan, Feb
• Spring Constellations - March, April, May
• Summer Constellations - June, July, August
• Autumn Constellation - Sept, Oct, Nov
• Constellation - he patterns of stars which are seen in the sky
• The Celestial Sphere - an imaginary sphere of which the observer is the center
• Asterism - star patterns that have been discovered but have not been officially identified as a constellation
• Hubble Space Telescope - produce sharper images and observes object which are 50 lines fainter from the earth's surface
• International Astronautical Union - they divide te sky into 88 official constellations with exact bounderies