The Universe – Season 2, Episode 10 – Constellations http://www.history.com/shows/theuniverse/videos/the-universe-constellations Constellations teach us about stars, directions, & seasons/time . . . Are the stars that make up the Orion constellation equal distance from Earth? ____ D_ _ _ _ _ _ _ is the most difficult question to answer about stars. The 3 great pyramids of Egypt are said to be lined up to the 3 stars in O _ _ _ _ _ B _ _ _ . What is the Ecliptic Plane and why is it called this? ________________________________ _____________________________________ \ This sextant was used by m _ _ _ _ _ _ _ to navigate using “guide stars” like Polaris, commonly known as the N _ _ _ _ Star. _ _ _ has replaced sextants. Write an explanation of Precession and draw the diagram on page 625 of your textbook using about half of the back of this sheet. The C_ _ _ _ _ _ _ _ G_ _ _ is a coordinate grid that shows position and direction in space from the Earth’s perspective, but it does not tell ____________. Lines of declination on the celestial grid correspond to the lines of ______________________ on Earth. Lines of right ascension on the celestial grid correspond to the lines of ______________________ on Earth. Just like your eyes look at the same object from two different positions, Astronomers look at a star from Earth’s orbit ______ months apart to measure the parallax ____________. The problem is that these angles are too _ _ _ _ _ , so astronomers often use Cepheid “variable” S _ _ _ _ or S _ _ _ _ _ _ _ _ _ _ . Draw a diagram of Parallax using the remaining half of this sheet – see page 702 in your textbook. The difference between the apparent magnitude of a star and its absolute magnitude or actual luminosity is _____________________________ _______________________________________?