THE MOON PHASES. We only see the part of the moon that is illuminated by the Sun.

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1 THE OON PHAE We oly see the part of the moo that is illmiated by the. I the diagram below we see that the s is o the right, ad every moo positio shows the illmiated part o the right Positio 1 North Pole s rays oo s orbit As the moo revolves arod the, we see differet amots of that illmiated moo ometimes oe of the lit part faces the (New moo) ad other times all of the lit part faces the (Fll moo) The oo moves coterclockwise. As the moo moves arod (from New to Fll) we see more ad more (the moo is waxig) ad the as it coties (from Fll back to New) we see less ad less (the moo is waig). The diagram below shows the phase of the moo i white.!! Waxig = illmiated o the right!!!! Waig = illmiated o the left Waxig Old crescet Gibbos First Last Qarter qarter Waxig Old gibbos Crescet Fll New oo oo North N Pole Fll New oo s rays rays s Waig New crescet Gibbos Last First qarter Qarter Waig New gibbos Crescet

2 oo Phases The moo s revoltio arod the takes 27.3 days The cycle of phases takes 29.5 days (how log it takes for s to see all of the phases of the moo) The cycle of phases is loger tha the oo s period of revoltio becase the is revolvig arod the s Below is a diagram showig the moo revolvig arod the, as the revolves arod the moo s orbit 5 light Notice i positio 1, the moo is directly betwee the ad the Bt by positio 5, eve thogh the moo is directly below the agai, it is o loger betwee the ad. The oo mst travel 2.2 more days to be exactly betwee the ad (ew moo)

3 olar Eclipse - is blocked by the oo (oo s shadow falls o ) - Ca oly occr i ew moo phase Partial Eclipse Umbra (fll shadow) =moo Total Eclipse Pembra (partial shadow) Lar Eclipse - oo is blocked by s shadow ( s shadow falls o oo) - Ca oly occr i fll moo phase Total Eclipse Umbra Partial Eclipse Pembra =moo

4 Tides Gravity betwee the moo ad cases a cyclic rise ad fall i ocea waters Locatios i lie with the moo have the strogest pll ad the highest s As the rotates, a locatio (labeled x) will experiece high ad low s. high x low high oo low Tides occr becase the moo s gravity plls the water closest to it 4 Tides i 24 hors Each day there are two high s ad two low s 6 hors betwee high ad low 12 hors betwee high ad the ext high

5 prig Tide - Very High ad Very Low Tides - Ca occr i ew moo ad fll moo phases Very High Tides =moo =moo Very Low Tides High Tides Low Tides Neap Tide - High ad Low Tides are less extreme - Ca occr i 1 st qarter moo ad 3 rd qarter moo phases

6 THE OON The oo revolves arod the oce every 27.3 days. The oo also rotates o its axis oce every 27.3 days. Becase these periods are the same, we oly ever see oe side of the oo from. The oo appears to rise 50 mites later each ight. Lar Phases Oly the side of the oo facig the is illmiated...the other side is dark. Whe the oo revolves arod the, we see varyig amots of this illmiated side...this is why we see the phases of the oo. Waxig meas the illmiated portio is gettig bigger each ight. Waig meas the illmiated portio is gettig smaller each ight. Eclipses A lar eclipse occrs whe the passes betwee the ad the oo casig the oo to be blocked ot by the shadow of the. Lar eclipses oly occr drig the Fll oo phase. A solar eclipse occrs whe the oo passes directly betwee the ad casig the to be blocked ot by the oo. olar eclipses oly occr drig the New oo phase. Eclipses do t occr every moth becase the oo s orbit is slightly tilted relative to the s path arod the. This cases the oo to be either above or below the most moths. Lar Eclipse olar Eclipse Tides Tides occr becase of the gravitatioal pll of the oo ad. There are two high ad two low s each day. prig Tides occr whe the,, ad oo are lied p casig higher tha ormal s prig s occr oly i the New ad Fll oo phases. Neap Tides occr whe the oo acts o its ow casig less severe high s. Neap s occr oly i the First ad Last Qarter phases. Tides are cyclic ad predictable. prig Tide Neap Tide

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