The Astronomy Center has provided educational resources to introductory astronomy educators since 2003. Over the past 20 years, the rapid pace of discovery has rendered some of our linked resources obsolete. Thus, the Astronomy Center will be decommissioned on March 1, 2022. Our highest quality resources will be retained on ComPADRE.org.

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Results #1-#10 of 67
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Match Score:
100
Byline:
M. Masetti; Publisher: Goddard Space Flight Center
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This website gives an impression of the size of our Universe, starting with the Earth and increasing scale until it reaches the scale of the visible universe. The user can view and…
  
Match Score:
100
Byline:
B. Bryson
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A cosmic journey in 42 steps of powers of ten starting with quarks (10^-14 meters) and ending with 'near the limit of our knowledge' (10^25 meters).
Galileo's Moon Mountain  [ Computer Program ]
  
Match Score:
100
Byline:
T. Timberlake
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The Galileo's Moon Mountain Model illustrates the method used by Galileo to measure the height of a mountain on the Moon. Using his improved telescope design, Galileo was able to see…
Galileo Sunspots  [ Computer Program ]
  
Match Score:
100
Byline:
T. Timberlake
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The EJS Galileo Sunspots Model illustrates the motion and changes in appearance of sunspots as they move across the disk of the Sun. Galileo's observation of the changing appearance…
Spheres of Eudoxus  [ Computer Program ]
  
Match Score:
100
Byline:
T. Timberlake
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This Spheres of Eudoxus model simulates the system devised by the Ancient Greek astronomer Eudoxus to model the motion of the planets. The model consists of four nested concentric…
Ptolemy/Copernicus/Tycho Model  [ Computer Program ]
  
Match Score:
100
Byline:
T. Timberlake
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The Ptolemy/Copernicus/Tycho EJS Model illustrates the relationships between the systems of planetary astronomy developed by Claudius Ptolemy, Nicholas Copernicus, and Tycho Brahe.…
Astronomical Parallax 2D  [ Computer Program ]
  
Match Score:
100
Byline:
T. Timberlake
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The Astronomical Parallax 2D Model illustrates the phenomenon of parallax in astronomy. Parallax is the apparent displacement of an object relative to the background that is caused…
Stellar Aberration 2D  [ Computer Program ]
  
Match Score:
100
Byline:
T. Timberlake
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The Stellar Aberration 2D Model illustrates the phenomenon known as the aberration of starlight, first reported by James Bradley in 1729. Aberration occurs because light has a finite…
Stellar Aberration 3D  [ Computer Program ]
  
Match Score:
100
Byline:
T. Timberlake
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The EJS Stellar Aberration 3D Model illustrates the phenomenon known as the aberration of starlight, first reported by James Bradley in 1729. Aberration occurs because light has a…
Parallactic Proper Motion  [ Computer Program ]
  
Match Score:
100
Byline:
T. Timberlake
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The EJS Parallactic Proper Motion Model illustrates the phenomenon known as parallactic proper motion. Proper motion refers to the progressive (non-oscillatory) apparent motion of a…
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Results #1-#10 of 67