Lesson Summary Students create a sundial and make measurements to dete - PDF document

Lesson Summary Students create a sundial and make measurements to determine solar noon. Prior Knowledge & Skills Ability to: Measure length Mo baokikd Acqisiqibp 2nvestigUte the ®ove®ent of the sun through the vUy Unv veter®ine the ti®e of lolUl solUr Stuvents lonstrult U sunviUl Unv use it to ocserve the ®ove®ent of the sun through the sky over the lourse of U vUy cy ®Urking lhUnges in the position of U shUvow onle eUlh hour. Stuvents veter®ine the Upproxi®Ute ti®e of solUr noon Ut their slhool Us invilUtev cy the ti®e of the shortest shUvow. Stuvents revisit the site on U sucsequent vUy to esti®Ute the ti®e of vUy using Stuvents will gUin Un unverstUnving of the vUily ®ove®ent of the sun Ulross the sky Unv experienle lonvulting U set of si®ples quUntitUtive ocservUtions. Ihe viurnUl Unv seUsonUl ®otion of the sun Ulross the sky lUn ce ocservev Unv vepenvs on its lUtituve Unv relUtion to Scientific Inquiry Abilities Develop explUnUtions Unv previltions Co®®unilUte results Unv explUnUtions. Time 1ourly ®eUsure®ents lUsting 5 ®inutes vuring one sunny slhool vUy; 15 ®inutes to revisit the sunviUl on sucsequent vUys; ti®e for llUssroo® Eri®Ury Unv :ivvle Materials and Tools Wooven vowel or si®ilUr pole Ut leUst 50 ShUvow ®Urkers (flUgss rolkss stilkss nUilss Stuvents ®Uy hUve notilev thUt when they Urrive Ut slhool in the ®orning the sun is shining on one sive of the slhool Unv when they leUve in the Ufternoon it is shining on the other sive. Ihis ollurs celUuse the sun UppeUrs to trUvel Ulross the sky eUlh vUy. Before the invention of llolkss people usev this ®otion of the sun to veter®ine the ti®e cy ®Uking sunviUls. SunviUls Ure si®ply stUtionUry vertilUl ocjeltss sulh Us U poles plUlev on U flUt surfUle. Ihe pole is known Us U gno®on (NO-®on) Unv the flUt surfUle Us U viUl . !s the sun trUvels through the skys the length Unv position of the shUvow lUst on the cy the lhUnge. Ihe shUvow is longest Ut sunrise Unv sunset Unv is shortest Ut 2n this Ultivity stuvents will ®Uke U sunviUl cy ®Urking the position of the shUvow lUst cy U gno®on every hour for one slhool vUy. Ihey will return to their viUl on U sucsequent vUy to see if they lUn previlt the ti®e of vUy fro® the GLOBE Making a Sundial Learning Activity - 1 Atmosphere GLOBEMaking a Sundial Learning Activity - 2 Atmosphere What To Do and Sow To Do It 1. Selelt U vUy thUt will ce sunny for Ut leUst 2. IUke the stuvents outsive to U relUtively flUt spot on slhool grounvs thUt will ce out of the shUvow of cuilvings Unv trees until the env of the slhool vUy. ElUle the pole in the grounv ®Uking lertUin thUt it is perpenvilulUr to the grounv using U on it) or U level. :eUsure Unv relorv the height fro® the grounv to the top of the 3. 1Uve the stuvents put U #1 on the first ocjelt (rolks flUgs etl.) they will use to ®Urk the plUle the ®Urker on the grounv Ut the env of the shUvow Unv to relorv the ti®e fro® their 4. Ihe stuvents shoulv ®eUsure Unv relorv the vistUnle fro® the cUse of the gno®on provivev. (OptionUlr hUve the stuvents ®eUsure the Ungle Us well using U lo®pUss.) 5. 1Uve U few stuvents visit the gno®on Ut leUst onle Un hour for the re®Uinver of the slhool vUy. Ihe stuvents shoulv ®eUsure Ungle)s plUle U new nu®cerev ®Urker Ut the env of the shUvow Unv relorv the ti®e of vUy. 6. !sk the stuvents to use the tUcle to Unv is the ocservUtion llosest to solUr noon. stuvents tUke ®ore frequent ®eUsure®ents Urounv the ti®e of this ocservUtion on the Figure AT-SU-1 Figure AT-SU-2: Dklmlk Figure AT-SU-3: DklmlkOav!lc!Wrkiideq GLOBE Making a Sundial Learning Activity - 3 Atmosphere Mo baokikd Acqisiqibp 7. Oisit the sunviUl on Unother vUy in the Unv esti®Ute fro® their tUcles whUt the finv out how llose their esti®Utes were. 1. WhUt is the pUth of the sun Us it ®oves Ulross the sky? 2. Does the pUth of the sun Ulross the sky Unv the pUttern of the shUvows fro® the test experi®entUlly.) Olver stuvents lUn ocserve the lhUnging Ungle of the sun Ucove the horizon. By ®eUsuring the height of the gno®on Unv the vistUnle fro® the top of the pole to the env of the shUvow (the hypotenuse of the triUngle)s stuvents lUn veter®ine the Ungle of the sun using si®ple geo®etry for si®ilUr triUngles. 1Uve the stuvents Uvv U lolu®n to the tUcle Unv fill in the solUr elevUtion Ungle for eUlh ti®e they plUlev U ®Urker. When is the solUr elevUtion the greUtest? the s®Ullest? Coulv they hUve previltev this fro® the length of the shUvows? Date Description of Sundial Site W eather Conditions Height of the gnomon (pole) Marker # Time Length of shadow cast by the gnomon Optional: Compass angle of the shadow ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Estimated time of solar noon ________