Demonstrations

Analemma

Code Number:	8A10.17?
Disclaimer:	Reprinted by permission of Dick Berg, University of Maryland, for use on this website. The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources. Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA. The University of Iowa Disclaimers: University of Iowa Disclaimer All Rights Reserved..
Condition :	Good
Principle :	Solar Position and Earth's Inclination
Area of Study :	Astronomy
Equipment :	Geochron.
Procedure :	Although there are methods of plotting solar position verses Earth's position, this usually takes one year for a full cycle. For practical purposes we use the built in chart on the Geochron. Position verses date can be observed.

Web Sites

A very nice time elapsed photo and explanation can be found: http://antwrp.gsfc.nasa.gov/apod/ap020709.html

References

Prabasaj Paul, "Analemma," TPT, Vol. 39, # 5, p. 265, (May 2001).

Dan M. Davis, "An Analemma Experiment," TPT, Vol. 38, # 9, p. 570, (Dec. 2000).

Mary Lou West, "Sunrise Surprise", TPT, Vol. 34, # 1, Jan. 1996, p. 52.

R. H. Garstang, "Sunrise and Sunset", TPT, Vol. 34, # 5, May 1996, p. 260.

"The Varying Lengths of Solar Days," TPT, Vol. 34, # 6, p. 355, (Sept. 1996).

Robert Mitchell, "Determination of the Subsolar Point or (Where on Earth Is the Sun?), TPT, Vol. 29, # 5, May 1991, p. 318.

D. Easton, "On the Sun, Earth, and Clocks", TPT, Vol. 23, # 2, Feb. 1985, p. 85 - 90.

Joseph S. Chalmers, "Ground Trajectories of Geosynchronous Satellites and the Analemma", AJP, Vol. 55, # 6, June 1987, p. 548.

5.8, "The Analemma", Project & Demonstrations in Astronomy by D.Tattersfield, p. 89.

Mail Questions and Comments to: Dale Stille