Being very difficult to measure, only about 60 stellar parallaxes had been obtained by the end of the 19th century, mostly by use of the filar micrometer.
32.
The stars are in fact much farther away than the distance that was generally assumed in ancient times, which is why stellar parallax is only detectable with telescopes.
33.
The stars are in fact much farther away than the distance that was generally assumed in ancient times, which is why stellar parallax is only detectable with precision instruments.
34.
He was elected a fellow of the Royal Society in 1840, and in 1892 was awarded one of the royal medals for his work on photometry and stellar parallax.
35.
Accurate calculations of distance based on stellar parallax require a measurement of the distance from the Earth to the Sun, now based on radar reflection off the surfaces of planets.
36.
After a sufficient number of observations are recorded over a period of time, they are plotted in stellar parallax, and hence the distance, of the system is known.
37.
In astronomy, the disparity between different locations on the Earth can be used to determine various celestial parallax, and Earth's orbit can be used for stellar parallax.
38.
Most of Jackson s time at the Cape was taken up with the determination of stellar parallax, a programme that had been started by his predecessor, Harold Spencer Jones.
39.
This assumption can also be expressed by saying that the stellar parallax caused by the motion of the Earth around its orbit equals the solar parallax caused by motion around the Earth.
40.
Scientific opposition came from Tycho Brahe and others, and arose from the fact that, if heliocentrism were true, an annual stellar parallax should be observed, though none was.
