| Browse by Subject: Astronomy
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Articles
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Eclipses
- An explanation of what eclipses are, with images and animations.
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Phases of the moon and planets
- An explanation of why we see the moon (and some
planets) change phases, with images and animations.
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Retrograde Motion of planets
- An explanation of the retrograde motion of some planets: why they seem to go back on their tracks, as viewed from Earth. With images and animations.
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Seasons
- An explanation of what seasons are, and why they occur. With animations and images.
Facts & Figures
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Glossary of astronomical terms
- A list of the astronomical terms used in the Science U Observatory pages.
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Sky Calendar, August 1998
- A list of interesting events on the sky, for the month of August, 1998.
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Sky Calendar, December 1998
- A list of interesting events on the sky, for the month of December, 1998.
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Sky Calendar, Index
- A month-by-month list of interesting events on the sky
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Sky Calendar, July 1998
- A list of interesting events on the sky, for the month of July, 1998.
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Sky Calendar, November 1998
- A list of interesting events on the sky, for the month of November, 1998.
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Sky Calendar, October 1998
- A list of interesting events on the sky, for the month of October, 1998.
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Sky Calendar, September 1998
- A list of interesting events on the sky, for the month of September, 1998.
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Solar System Data
- Data about the planets in the Solar System.
Masses, temperatures, distances to sun, periods,
orbits, etc.
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The Orrery
- A Solar System Simulator, a planet finder, a planetarium, a night sky simulator, an ephemerides computer, and more.
Fun & Games
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The Orrery
- A Solar System Simulator, a planet finder, a planetarium, a night sky simulator, an ephemerides computer, and more.
Graphics Archive
Current Events
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Sky Calendar, August 1998
- A list of interesting events on the sky, for the month of August, 1998.
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Sky Calendar, December 1998
- A list of interesting events on the sky, for the month of December, 1998.
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Sky Calendar, Index
- A month-by-month list of interesting events on the sky
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Sky Calendar, July 1998
- A list of interesting events on the sky, for the month of July, 1998.
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Sky Calendar, November 1998
- A list of interesting events on the sky, for the month of November, 1998.
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Sky Calendar, October 1998
- A list of interesting events on the sky, for the month of October, 1998.
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Sky Calendar, September 1998
- A list of interesting events on the sky, for the month of September, 1998.
Activities for Home & School
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Sky Calendar, August 1998
- A list of interesting events on the sky, for the month of August, 1998.
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Sky Calendar, December 1998
- A list of interesting events on the sky, for the month of December, 1998.
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Sky Calendar, Index
- A month-by-month list of interesting events on the sky
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Sky Calendar, July 1998
- A list of interesting events on the sky, for the month of July, 1998.
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Sky Calendar, November 1998
- A list of interesting events on the sky, for the month of November, 1998.
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Sky Calendar, October 1998
- A list of interesting events on the sky, for the month of October, 1998.
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Sky Calendar, September 1998
- A list of interesting events on the sky, for the month of September, 1998.
Online Interactive
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The Orrery
- A Solar System Simulator, a planet finder, a planetarium, a night sky simulator, an ephemerides computer, and more.
Software Library
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Downloadable Software
- Educational Shareware and Freeware related to fields of math and science available for free download.
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