Read over this handout and complete the lab. You will enter in all data into this data tables document. You will then need to save and upload the data tables/pictures/questions, when finished, here. Don’t forget to insert the required images inside the document – do not upload the images here! Remember, each lab may be done with a lab partner, but your calculations and post-lab questions must be done individually!

Note: The link may not work in the handout, so follow this link (or copy and paste this into the url bar: http://astro.unl.edu/naap/motion1/animations/seasons_ecliptic.html). Also, it doesn’t like to run on anything other than Internet Explorer, so if it doesn’t work in your current browser, try IE.

Question 1 (10 pts): The table below contains entries for the coordinates for the sun on the ecliptic as well as the latitude at which the most direct and least direct rays of the sun are hitting. Use the simulation to complete the table.

Date	RA	DEC	Latitude of Most Direct	Latitude of Least Direct Ray
February 5
March 21
May 5	2.9 h	+16.5°	16.5° N	73.5° S
June 21
August 5
September 21
November 5
December 21

Question 2 (10 pts): Using the data in the table above, formulate general rules relating the declination of the sun to the latitude where the most direct and least direct rays of the sun are hitting.

Question 3 (10 pts): The region between the Tropic of Cancer and the Tropic of Capricorn is commonly known as the tropics. Using the sunlight data table from above, define the significance of this region.

Question 4 (10 pts): Using the above sunlight data table, define the significance of the region north of the Arctic Circle commonly referred to simply as the Arctic.

Question 5 (10 pts): Use the simulator to complete the table below. For each latitude write a short paragraph which describes the variations in sunlight (seasons) that are experienced at this latitude throughout the year.

Latitude	Description of Yearly Pattern of Sunlight
0°	The noon sun’s angular height above the horizon ranges from 90° on the vernal equinox, to 66.5° on the summer solstice, to 90° on the autumnal equinox, and back to 66.5° on the winter solstice. Thus, the equator always receives very direct intense sunlight throughout the year which accounts for the very high temperatures.
23.5° N
41° N
66.5° N
90° N

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