Volume 4 (1970)

Title Page

Contents

SUR L’ORIGINE DES ÉTOILES DOUBLES
N. Boneff (in Bulgarian, Summary in French)

SUR LA ROTATION RÉTROGRADE DE VNUS (iII)
N. Boneff (in Russian, Summary in French)

COSMOLOGICAL FOUNDATION OF THE ABSOLUTE GEOCHRONOLOGY
R. G. Zaikov (in Russian, Summary in English)

BESTIMMUNG DER ÄQUATORIALEN TOPOZENTRISCHEN KOORDINATEN DER KÜNSTLICHEN ERDSATELLITEN DURCH BERECHNETE ENTFERNUNGEN AUS PHOTOGRAPHISCHEN BEOBACHTUNGEN
N. Georgiev, Zw. Daraktschiev (in Bulgarian, Summary in German)

CORRÉLATION ENTRE TROIS CYCLES DE ONZE ANS CONSÉCUTIFS D’ACTIVITÉ SOLAIRE
A. Bonov (in Bulgarian, Summary in French)

LE CYCLE DE 22 ANS ET LE CHANGEMENT SÉCULAIRE DE L’ACTIVITÉ SOLAIRE
A. Bonov (in Bulgarian, Summary in French)

TELESCOPIC OBSERVATIONS OF METEORS DURING THE PERSEID STREAM IN SOFIA IN 1968
S. Vladimirov, N. Nikolov (in Russian, Summary in English)

ON A QUICK AND EASY OF ACCESS METHOD OF TREATMENT OF TRANSMISSION TRACINGS
V. M. Dobrichev (in Russian, Summary in English)

SPECTROPHOTOMETRIC INVESTIGATION OF THE PECULIAR VARIABLE KR AURIGAE
M. Popova (in Russian, Summary in English)

ROTATION OF THE COMPONENTS IN SYSTEM 68u HERCULES
B. Kovachev, Z. Kraicheva (in Russian, Summary in English)

ON THE PERIOD-LUMINOSITY RELATION OF THE CEPHEIDS
A. S. Nicolov, N. S. Nicolov (in Bulgarian, Summary in English)

ON THE SHAPES OF THE LIGHT AND COLOUR CURVES OF THE CEPHEIDS IN THE U, B, V SYSTEM
N. Nikolov, R. Russev, S. Milcheva (in Russian, Summary in English)

A STATISTICAL INVESTIGATION OF THE LONG-PERIOD CEPHEID LIGHT CURVES
R. Radkov (in Bulgarian, Summary in English)

SOME EFFECTS AT SPHERIC SYMMETRICAL CLUSTERS OF GALAXIES OR STARS EXPANDING BY HUBBLE
M. Kalinkov, D. Fakirov (in Bulgarian, Summary in English)

INVESTIGATION OF THE COMA CLUSTER OF GALAXIES
M. Kalinkov

ROTATION OF THE HERCULES CLUSTER OF GALAXIES
M. Kalinkov