Using the daily Mt. Wilson velocity data during 1986-1994, we found 1.3 ± 0.1 yr periodicity - is dominant in the Sun's surface `mean' rotation rate (A ) during 1986-1994 (solar cycle 22). A 153 ± 5 - day periodicity found ...

A group of five observers have participated in visual, photographic and MST radar observations of Leonid meteor shower during 15-20 November 1998 at National MST Radar Facility (NMRF), Gadanki (13.47 deg N, 79.18 deg E) ...

In latitude interval 20 deg -30 deg, the dependencies (i) 'initial' meridional motion, vini(?), of sunspot groups with life spans ??= 2-12 days, on ? of the spot groups, and (ii) mean meridional motion, v(?), of sunspot ...

High resolution spectra were obtained for a sample of hydrogen-deficient stars which are hotter than the R CrB stars and cooler among the extreme helium stars (EHe). We believe that these stars are transition objects ...

This essay briefly describes the present status of research on accretion disks around compact objects - in particular, blackholes - covering both the thin and thick disks. Significant results from various analyses regarding ...

Optical positions of 304 Markarian galaxies, MRK 1096 to 1339, are given with accuracies better than 1 arcsec.