The Declination Systematic Errors Δδ_δ and Δα_δcosδ Obtained by Means of the Observations Made with the Photoelectric Astrolabes of Two Different Stations

An attempt to synthesize astrolabe catalogues is made in this paper by means of the residuals of the observations carried out with two photoelectric astrolabes respectively belonging to Yunnan and Beijing Observatories, i.e.,two catalogue systemes can be joined by reassessing the values of the quantities of K and ΔD.The synthetical Δδ_δ and Δα_δcosδ systems of the two observatories arc also calculated.Finally, the catalog is compared with other meridian and astrolabe catalogs,the results according with each other comparatively well except for the area of δ≤°.