van Altena, William F. Department of Astronomy, Yale University, New Haven, Connecticut.
- Geocentric parallax
- Heliocentric or trigonometric parallax
- Space-based parallaxes
- Statistical and secular parallax
- Links to Primary Literature
- Additional Readings
The apparent angular displacement of a celestial object due to a change in the position of the observer. With a baseline of known length between two observations, the distance to the object can be determined directly. The topic of parallax is divided into several subtopics: geocentric parallaxes, which use the surface of the Earth as a baseline to observe solar system objects; heliocentric or trigonometric parallaxes, which use the diameter of the Earth's orbit around the Sun to observe objects in the solar neighborhood; statistical and secular parallaxes, which are statistical methods used to derive distances based on the proper motions of the objects; and photometric and spectroscopic parallaxes, which rely on the normal astrophysical properties of stars to derive distances to them indirectly. Parallaxes have been determined from space satellites, including HIPPARCOS and the Hubble Space Telescope, and additional space projects are planned, such as Gaia and SIM.
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information