parallactic


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Related to parallactic: parallactic inequality

par·al·lac·tic

(par'ă-lak'tik),
Relating to a parallax.

par·al·lac·tic

(par'ă-lak'tik)
Relating to a parallax.
References in periodicals archive ?
The team plans to use parallactic motion again in the future.
With Ptolemy's parallactic instrument with a chord rule of only 60P, altitudes below 300 could not be measured but only estimated.
A (triangle-type instruments) Special function 1, 2 described in the treatise B Chord arm on circle 3 C (wire instruments) Sine, chord, and tangent 5, 6 D (square-type instruments) Tangent 7, 8 E Sine and versine 10, 11 F (improved Ptolemy's Chord 9, 4 parallactic instrument) G Pinhole device 12
This is a rotating parallactic rule: a base cross of 4 fg square rules is aligned in the meridian and east--west lines.
It is interesting to note that al-'Urdi's "perfect instrument" likewise used a parallactic rule, but inside a circle, so the azimuth was read by putting the chord rule onto the azimuth ring.
Our author's critique is similar to al-'Urdi's opinion of Ptolemy's parallactic rule given at the end of his own treatise.
Unlike parallactic measurement, the poem does not provide an identifiable answer to the questions it raises.
Its angles are: the Meridian Angle at the Pole, the Azimuthal Angle at the observer, and the Parallactic Angle at the Geographical Position.