To reduce the instrumental and calibration errors in the photoelectric photometry as much as possible it is necessary to select the optimum photocell voltage and energy attenaution and to observe as many standard stars as possible over the wide range of color, spectral type and air mass.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. SELECTION OF THEOPTIMUM PHOTOCELL VOLTAGE AND ATTENUATION
Ⅲ. DETERMINATION OF ATMOSPHERIC EXTINCTION COEFFICIENTS
Ⅳ. TRANSFORMATION OF THE NATURAL SYSTEM TO THE STANDARDSYSTEM
REFERENCES

• SEE-WOO LEE(Department of Earth Science Kyungpook National University)