The researches of the astronomers have proved that there is not one star for which the parallax is equal to that of another.
We have also ascertained that the annual parallax is about half a second.
Bessel had anticipated him with the parallax of 61 Cygni by just two months.
Not go in and blurt out what you know you're not to: what's parallax?
The seventh and eighth columns give the annual parallax and the corresponding distance expressed in siriometers.
Then I tried to remember what was the parallax of this star.
Here we have only to do with near stars for which the annual parallax is well determined.
It is the distance of a star that has a parallax of one second of arc.
The detection of the parallax of the stars depended on the improvement of instruments for the measurement of angles.
But its parallax (about 0″·08) shows that it is about 128 times brighter than the sun!
parallax par·al·lax (pār'ə-lāks')
The apparent displacement of an object caused by a change in the position from which it is viewed.
An apparent shift in the position of an object, such as a star, caused by a change in the observer's position that provides a new line of sight. The parallax of nearby stars caused by observing them from opposite points in Earth's orbit around the Sun is used in estimating the stars' distance from Earth through triangulation.