Volume 6 (1973)

Title Page

Contents

SOLAR CYCLES AND WORLD POPULATION GROWTH
R. Zaikov

GALACTIC ROTATION AND GEOLOGIC CYCLES
R. Zaikov

CHARACTERISTIC FEATURES OF THE SECULIARY AND SUPER-SECULIARY CYCLES OF SOLAR ACTIVITY.
180-YEAR CYCLIC CHANGE IN THE SOLAR ACTIVITY
A. Bonov (in Bulgarian, Summary in English)

ON THE DISCREPANCY BETWEEN EVEN AND ODD 11-YEAR CYCLES IN SOLAR ACTIVITY
A. Bonov (in Bulgarian, Summary in English)

ON THE STELLAR PHOTOMETRY IN THE PALOMAR OBSERVATORY SKY SURVEY
M. Popova, M. Tsvetkov (in Bulgarian, Summary in English)

STRUCTURE OF THE NUCLEUS OF THE OPEN STAR CLUSTER NGC 1245
M. Popova, M. Tsvetkov (in Bulgarian, Summary in English)

REDUCTION OF U–B-PHOTOELECTRIC OBSERVATIONS OF CEPHEIDS IN A UNIFORM SYSTEM
N. Nikolov, P. Kunchev, G. Ivanov (in Bulgarian, Summary in English)

EVIDENCE FOR THE EXISTENCE OF CLUSTERS OF CLUSTERS OF GALAXIES AROUND THE NORTH GALACTIC POLE
M. Kalinkov (in Bulgarian, Summary in English)

ON SOME INTEGRALS, WHOSE SUB-INTEGRAL FUNCTION IS RELATED TO SPHERICAL FUNCTIONS
V. Shkodrov (in Russian, Summary in English)

ON SOME INTEGRAL PROPERTIES OF SPHERICAL FUNCTIONS
V. Shkodrov (in Russian, Summary in English)

NOMOGRAMS TO CALCULATE HORIZONTAL COORDINATES OF SATELLITES
D. Metodiev (in Bulgarian, Summary in English)

ELECTROPHOTOMETRIC EQUIPMENT IN THE STARA ZAGORA OBSERVATORY
M. Gogoshev, T. Raichev (in Bulgarian, Summary in English)