diurnal parallax

noun

1. See parallax

Example Sentences

In the case of Brahe’s observations of the nova and the 1577 comet the data was an absence of diurnal parallax, the phenomenon that needed to be explained was that these new bodies were in the supralunary and not the sublunary world, and the immediate theoretical conclusion that resulted was that there was change in the heavens.

From Literature

This was not true in all cases where diurnal parallax was observed; as we have seen, refraction might make it possible to open up a gap between data and phenomena, and even if Brahe’s measurements of Mars’s parallax had been correct, they would not have helped decide between his cosmology and that of Copernicus.

From Literature

Unfortunately, in 1548 a text, apparently by Regiomontanus, was published which claimed to measure the parallax of the comet which had appeared in 1472, and to confirm that it was close to the Earth because the parallax was a whopping 6 degrees—placing it much closer than the moon, which has a diurnal parallax of about 1 degree.

From Literature

Within a year or two of Galileo’s telescopic discoveries no one disputed that the moon had mountains, Jupiter had moons, Venus had phases and the sun had spots, and thus Galileo’s observations were conclusive in a way that Brahe’s measurements of diurnal parallax should have been, but weren’t.

From Literature

The stars have no diurnal parallax, because, owing to their great distance, the Earth’s radius does not subtend any measurable angle, but the radius of the Earth’s orbit, which is immensely larger, does, in the case of a few stars, subtend a very minute angle.

From Project Gutenberg