ASTR 100Lgx Lecture Notes - Lecture 3: Celestial Equator, Telescopium, Summer Triangle
Document Summary
Constellations: specific regions of the sky with well-defined borders, centered on the greco- Triangulum, microscopium: the official boundaries of the constellations were drawn up in 1928. Degrees, minutes, seconds: angles are measured in degrees ( ), arcminutes ( ), and arcseconds ( ) Angular size vs. actual size: objects may have the same angular size, but may be significantly different in actual size because of the difference in distance from the observer. Changes in the night sky: nightly changes as stars rise and set with earth"s rotation, night sky also changes seasonally. Stars circling earth, or do they : earth rotates from west to east, which causes apparent east-west rotation of celestial sphere. Seasons on earth: contrary to popular belief, it is not the change in distance between the sun and. 2: summer occurs in your hemisphere when sunlight hits i more directly and winter occurs when the sunlight is less direct.
