Download Phases of Moon, Lunar and Solar in Astronomy | AST 2002 and more Study notes Astronomy in PDF only on Docsity! 1 © 2005 Pearson Education Inc., publishing as Addison-Wesley announcements • HW #5 is on MA and due Friday. • MA -- 12 out of 256 are not signed up. • Clickers -- 27 out of 256 not yet registered. • If you’re having trouble with material, see me, TAs, tutors… © 2005 Pearson Education Inc., publishing as Addison-Wesley announcements • Still missing syll acknowledgement forms from 19 people: BEC/B COM/A DAV/M GEL/M GEO/C GON/D HER/S JOH/N LAC/K LUC/B MCC/C MCC/J MUI/A OTK/M REJ/L SCH/J UCC/L WAI/S ZAI/A © 2005 Pearson Education Inc., publishing as Addison-Wesley news • Summer ends tomorrow --- the fall equinox is tomorrow. The exact time of the Sun crossing the Celestial Equator is 5:18pm. © 2005 Pearson Education Inc., publishing as Addison-Wesley Chapter 2 Discovering the Universe for Yourself • 2.1 - Celestial Sphere • 2.2 - Seasons • 2.3 - Moon Phases & Eclipses • 2.4 - skip for now © 2005 Pearson Education Inc., publishing as Addison-Wesley Reading check 1. Phases of the Moon are caused by A. Earth blocking sunlight from reaching the Moon. B. how much of the Moon’s lit-up half is on the half you see (i.e. its Earth-facing side). C. sunlight reflecting off of Earth and hitting the Moon. 2. To see a solar eclipse, you need to be A. between the Sun and the Moon. B. in the Moon’s shadow. C. in Earth’s shadow. D. in darkness, on the night side of Earth. © 2005 Pearson Education Inc., publishing as Addison-Wesley Section 2.3 The Moon Two extremely important, fundamental concepts here: • Phases of the Moon • Eclipses -- Lunar and Solar There are tutorials about these two concepts in MasteringAstronomy. Again -- trust me -- you will want to do those tutorials! 2 © 2005 Pearson Education Inc., publishing as Addison-Wesley The phases are just caused by which parts of the lit half and which parts of the dark half we see. • Half the Moon is illuminated by Sun, and half dark • We see some combination of the bright and dark faces Fig .19 © 2005 Pearson Education Inc., publishing as Addison-Wesley But be careful! • This figure is a bit misleading in that the Moon might be oriented differently when you actually see it in the sky. Fig .19 © 2005 Pearson Education Inc., publishing as Addison-Wesley Compare to crescent in fig 2.19 © 2005 Pearson Education Inc., publishing as Addison-Wesley Compare to gibbous in fig 2.19 © 2005 Pearson Education Inc., publishing as Addison-Wesley Compare to crescent in fig 2.19 The lit-up side always points toward the Sun --- and that’s not always straight to th left or right. © 2005 Pearson Education Inc., publishing as Addison-Wesley W ax in g Waxing W an in gW aning
