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parallax

How To Measure the Universe

May 29, 2012

Want to stay on top of all the space news? Follow @universetoday on Twitter Measuring distance doesn’t sound like a very challenging thing to do — just pick your standard unit of choice and corresponding tool calibrated to it, and see how the numbers add up. Use a meter stick, a tape measure, or perhaps [...]

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Help Astronomers Measure the Solar System!

January 30, 2012

As the bright Mars-crossing asteroid 433 Eros makes its closest approach to Earth since 1975, astronomers around the globe are taking the opportunity to measure its position in the sky, thereby fine-tuning our working knowledge of distances in the solar system. Using the optical principle of parallax, whereby different viewpoints of the same object show [...]

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Motion Parallax

November 16, 2010

Motion parallax is a depth cue that our minds associates with out movement. We see objects that are closer to us as moving faster than objects that are in the distance. We are able to see the full speed motion of the close items, but distant objects seem to be moving at a slower rate. [...]

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What Is Parallax

September 15, 2010

Here is the short answer to ‘what is parallax’: it is an apparent displacement(difference) in the apparent position of an object viewed along two different lines of sight. It is measured by the angle or semi-angle of inclination between those two lines. Objects that are closer to the solar system have a larger parallax than [...]

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Stellar Parallax

December 10, 2009

Parallax is the apparent difference in the position (line of sight to) an object, when the object is viewed from different locations. So, when we observe that a star has apparently moved (not to be confused with it actually having moved – proper motion), when we look at it from two different locations on the [...]

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