Tutorial on Earth/Sun Relations and Seasons
To understand why we have seasons, we need to look at the relations ... The sun's rays are pretty close to parallel to each other when they reach the Earth, ...
http://daphne.palomar.edu/jthorngren/tutorial.htm
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SKY-MAP.ORG
Interactive online sky map ... SKY-MAP.ORG. Stars That Shine Forever. Supernova: Chich. Nova: Pasquale Nanula. HE IT FR ZH RU SV PT SR PL DE HU ES JA EN KO TR EL NL ...
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NASA Science - Science Mission Directorate
Research news from NASA.
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NASA - JPL Solar System Simulator
Simulated view of any body in the solar system from any location and time in full-color graphics. A NASA/JPL space site.
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Hubble Heritage Gallery of Images
No information avaiable
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Astronomy Picture of the Day
A different astronomy and space science related image is featured each day, along with a brief explanation.
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Imagine The Universe! Home Page
Dedicated to discussion about the universe, how it is evolving, and the kinds of objects and phenomena it contains. A service of NASA's High-Energy Astrophysics ...
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Universe Sandbox | created by Dan Dixon
An interactive space simulator for Windows. Run scale simulations of our solar system and galaxy while controling gravity, time, and everything in it.
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the Analemma
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Your Sky
Interactive planetarium that can produce maps for any time and date, viewpoint, and observing location.
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StarChild: A Learning Center for Young Astronomers
This site is intended for students in grades K through 8. ... (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/ GSFC. ...
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