Revision as of 05:58, 9 March 2008 edit Fongchunyin (talk \| contribs) 2 edits No edit summary ← Previous edit		Revision as of 07:37, 9 March 2008 edit undo Fongchunyin (talk \| contribs) 2 edits →Principles of Measurement Next edit →
Line 22: The reason for this apparent movement is that the Earth has moved over the period of a year. This change in observing position has meant that a close star will have an apparent movement when compared with a more distant set of stars. The closer a star is to the Earth, the greater will the parallax shift be. Since all stars are very distant, this effect is a very small one and the parallax angle will be very small. It is usual to quote parallax angles not in degrees, but in seconds. An angle of 1 second of arc ('') is equal to one sixtieth of 1 minute of arc (') and 1 minute of arc is equal to one sixtieth of a degree. ~~{{astronomy-stub}}~~ == References == * {{cite paper\|title=The Milky Way Tomography with SDSS\|author=Mario Juric, Zeljko Ivezic, Alyson Brooks, Robert H. Lupton, David Schlegel, Douglas Finkbeiner, Nikhil Padmanabhan, Nicholas Bond, Constance M. Rockosi, Gillian R. Knapp, James E. Gunn, Takahiro Sumi, Donald Schneider, J.C. Barentine, Howard J. Brewington, J. Brinkmann, Masataka Fukugita, Michael Harvanek, S.J. Kleinman, Jurek Krzesinski, Dan Long, Eric H. Neilsen, Jr., Atsuko Nitta, Stephanie A. Snedden, Donald G. York\|url=http://www.arxiv.org/abs/astro-ph/0510520\|date=2005-10-18}}

Photometric parallax: Difference between revisions