A new treatise on astronomy, and the use of globes : in two parts ... (1866)
M'Intire, James, 1799-1879 · New York : Published by A.S. Barnes & Burr ... · leaf 149
to the extremity ofthe radius vector of the earthsorbit, at right angles to the firstline, the angle contained bythese lines is called the AnnualParallax of that star. Or theannual parallax is the greatestangle at the star subtended bythe radius of the earths orbit. Thus let the line « S be… … Wliat singular phenomenon do they generally exhibit ? What interesting diacoTery has been made by Sir W. Herschel in relation to manyof the double stars ? What are these called ? Name some of the mostprominent binary stars and their periods ? 182. What is the annual parallax of a star ? Illustrate…
Astronomy
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