Hence ( the points ) where the ecliptic and the equator intersect should give the north polar distances of the spring and autumn equinoxes.
2.
This would have allowed them to measure the north polar distance ( declination ) a measurement that gave the position in a " xiu " ( right ascension ).
3.
The difference between the circle reading after observing a star and the reading corresponding to the zenith was the zenith distance of the star, and this plus the colatitude was the north polar distance.
4.
The mean position of the North Star Polaris ( Alpha Ursae Minoris ) on the first of January was Right Ascension, 1 hour, 41 minutes, 59 seconds; North Polar distance, 1 hour, 1 minute, and 33.8 seconds.
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