1 - Earth, Moon & Sun

Imagemap
1 - Earth, Moon & Sun1-1 Planet EarthFeaturesWater as liquidAtmosphereNitrogen, OxygenMagnetic FieldSky ColourScattering of blue light by nitrogenAtmosphereBenefitsImaginary line between Sun and Earth, pl ...Protects from harmful ultraviolet radiat ...Makes the climate and temperature of Ear ...Spreads out and scatter light from the S ...Protects us from micro meteorite collisi ...DrawbacksHolds in some "greenhouse" gases that re ...Necessary for lifeHuman made greenhouse gases are harmful  ...Clouds regularly obscure good astronomic ...Refracts light which means the position  ...Pollution from light and chemicals obscu ...Reflects most radiation making observati ...Light PollutionOptical PollutionHuman-madeChemical PollutionShape - oblate spheroid/flattened sphereEvidenceMoon is roundShadow of Lunar Eclipse is roundTall ships pass over horizonTravellers measuring position of stars a ...Size - Diameter - 13,000kmEratosthenesMeasurements by distance and shadowRotation Period23 hours 56 minutes (sidereal)1 degree every 4 minsTermsEquatorTropics Latitude Longitude Pole Horizon Meridian ZenithTelescopesReflectorLensNot good for large telescopesRefractor	MirrorSitingSpace - observe in IR,UV & X-RayMountainsDryLess AtmosphereLess light pollutionRadiationInfra-red - little to surfaceUltra-violet - little to surfaceX-Ray - none to surfaceVan Allen BeltsMagnetic FieldTrapped protonsDiscoveryAstronomical Unit (AU)Mean average distance between Earth and  ...150,000,000 km1-2 The MoonSize - Diameter - 13,000kmDistance - 380,000kmRotational & Orbital period = 27.3 daysFar side not visibleSynchronous rotationLunar Seas (Maria)DarkerYoungerLess on far sideHighlands (Terrae)OlderSolar SystemPrincipal FeaturesSea of TranquilityOcean of StormsSea of CrisesTycho craterCopernicus craterKepler craterApennine mountain rangeLack of atmosphere - lower gravityRilles / Wrinkle RidgesOriginsGiant Impact theoryComparison of Moon to Earth rocksApolloManned spaceflightExperiments (ALSEPS)Mirror - measure distanceSeismographs - moonquakesSolar radiation sensors1-3 The SunSize1.4million kmDistance150 million kmAtmospherePhotosphere5,800kChromosphereThink pink bandCorona2 million KRotation Period25 days equator, 36 days polesSun Spot driftSun SpotUmbra/PenumbraSolar cycle11 yearsButterfly DiagramFrequency & Position of SunspotsSafetyProjectingSolar FiltersWelder's glassesNuclear Fusion reactionsCoreConverts hydrogen to heliumWavelengthsAppearance – View features & layersVisibleH-alphaX-RayUltravioletInfraredSolar WindCharged particles from SunHigh Velocity – 400km per second1-4 InteractionsApparent SizeMoon 400 times smaller than SunMoon 400 times nearer than SunLunar PhaseCycle – 29.5 days2.2 days longer than Orbit periodPhasesNew MoonWaxing CrescentHalf Moon (First quarter)Waxing GibbousFull MoonWaning GibbousHalf Moon (Third Quarter)Waning CrescentNew MoonDaySolar Day24 hoursTime for Earth to rotate as judged by th ...Longer than sidereal as Earth orbiting S ...Sidereal day23hr 56 minsTime for Earth to rotate as judged by th ...Shadow StickMeasure shadow caused by the SunDetermines noon at observer’s position b ...Can be used with clock to determine diff ...SundialFixed to North/SouthGnomon correct anglePlate shows hours to enable reading of t ...DisavantagesRequires SunlightNot useful at nightNeed to use Equation of Time for accurac ...DaylightSeasonal variationsAxial tilt of EarthApparent vs. Mean SunApparent – Actual PositionMean – ‘Average’ position (by our clocks ...Equation of TimeSeasonal variation of light vs. position ...Apparent solar time — Mean solar timeAuroraeCharged solar particles from SunInteracts with Magnetic field around Ear ...Bright displays of coloured light in nig ...Best seen where the magnetic fields culm ...Towards North & South poles
hide
1 - Earth, Moon & Sun
hide
1-1 Planet Earth