concept, and often misunderstood, make sure you really understand it!) 18. Where
ID: 288195 • Letter: C
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concept, and often misunderstood, make sure you really understand it!) 18. Where are the Tropics of Cancer and Capricorn; why are they important? 19. Use figure 3.20 from your book (pg. 53) to estimate where the solar declination is on the following dates: Jan 30, Feb 30, Mar 21, Apr 15, May 15, June 21, Aug 1, Sep 21, Nov 15, Dec 21 20. Draw from memory the Earth-Sun relationship on the four important days of the year we discussed in class as well as where the earth is TODAY in the diagram (list the names, dates and solar declination on those days). 21. Explain in detail (referring to the key ideas explained above) exactly why we have seasons on Earth and what is happening within the Earth-Sun relationship as the Earth revolves around the sun. 22. What would conditions on Earth look like if the axis of rotation was perpendicular to the orbital plane of the ecliptic? (For full credit refer to 1) insolation receipt, 2) the location of the solar declination and 3) the seasons.,)Explanation / Answer
Q.22) What would conditions on Earth look like if the axis of rotation was perpendicular to the orbital plane of the ecliptic ?
Ans. Insolation reciept: Now in the present case insolation is more intense in low latitude than in the high latitude. As we move away from the equator to poleward, the mean annual temperature show lower values. Now, if the axis of rotation is perpendicular to the orbital plane of the ecliptic, then the length of day and night in any place of the Earth become same. So, insolation received in any place of the earth will become constant. Because Sun will be in a constant position with respect to the any place of the Earth. But insolation received at the equator is greater than high latitudes.
The location of the solar declination: Declination is defined as the angle between the Sun's rays and equatorial plne. And this is varies from 0-23.5o throught the year. Now, if the axis of rotation is perpendicular to the orbital plane of the ecliptic the declination become 0.
The seasons: As the length of day and night become same and the insolation received become constant in case of the perpendicular axis of rotationto with respect to the orbital plane of the ecliptic, there willbe a constant seasons in the Earth. Any place of the earth will not suffer seasonal variation.
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