Our Corner of the Universe
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Transcript of Our Corner of the Universe
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Our Corner of the UniverseOur Corner of the Universe
100 mil ly 5 mil ly
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Our NeighborhoodOur Neighborhood
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Earth’s rotation, orbit and the Earth’s rotation, orbit and the seasonsseasons
Only 50% of the Only 50% of the Earth’s surface can Earth’s surface can be “lit” by the sunbe “lit” by the sun
Because the Earth’s Because the Earth’s axis is tilted the area axis is tilted the area covered by this 50% covered by this 50% varies throughout the varies throughout the yearyear
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Most important variablesMost important variables
Earth’s orbit is 365.25 days longEarth’s orbit is 365.25 days long
Earth’s axis of rotation tilts 23.5° from the Earth’s axis of rotation tilts 23.5° from the perpendicularperpendicular
These two variables account for the seasonal These two variables account for the seasonal changes in weather patterns that we observe changes in weather patterns that we observe in a given yearin a given year
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We have four seasons: why?We have four seasons: why?
The Earth’s axis of The Earth’s axis of rotation is tilted at rotation is tilted at
23.5° from the 23.5° from the perpendicularperpendicular
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Earth-Sun RelationsEarth-Sun Relations
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LatitudeLatitude
Affects the amount of insolation received Affects the amount of insolation received at the Earth’s surfaceat the Earth’s surface
The The subsolar pointsubsolar point (at right angles to the (at right angles to the plane of the ecliptic) receives most plane of the ecliptic) receives most insolationinsolation Insolation decreases north and south of this Insolation decreases north and south of this
pointpoint The subsolar point migrates from 23.5°N The subsolar point migrates from 23.5°N
in the summer to 23.5°S in the winterin the summer to 23.5°S in the winter
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Subsolar point
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The latitudinal zonesThe latitudinal zones
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Perihelion vs AphelionPerihelion vs Aphelion
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MILANKOVITCH CYCLESMILANKOVITCH CYCLES
- ACCOUNTS ACCOUNTS FOR FOR PERIODIC PERIODIC GLACIATION GLACIATION OF EARTHOF EARTH
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MILANKOVITCH CYCLESMILANKOVITCH CYCLES
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MILANKOVITCH CYCLESMILANKOVITCH CYCLES
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THE NEXT ICE AGE?
WHEN