error of graduation meaning in Hindi

• अंशांकन अशुद् धि • अंशांकन अशुद्धि

error: गलती त्रुटि दोष
of: स् का की पर बाबत
graduation: अंशांकन

In observations of stars refraction was taken into account as well as the errors of graduation and flexure.
By averaging the four readings the eccentricity ( from inaccurate centering of the circles ) and the errors of graduation were greatly reduced.