... Contacting and discussing with people sharing your interests, participating in night sky observations with telescopes as well as a large choice of astronomical books, magazines and video-tapes out of our club library. ... A reasonable compromise for observing both planets and brightest deep sky objects ( nebulae, galaxies) are either a 4 to 8 inch mirror telescope ( Newton, Schmidt-Cassegrain ) or a 3 to 4 inch refracting ( lens) telescope. ... Where can I buy a telescope in Luxembourg ? ...

When using a large number of Virtual Hosts, Apache may run out of available file descriptors (sometimes called file handles if each Virtual Host specifies different log files. ... Unix operating systems limit the number of file descriptors that may be used by a process; the limit is typically 64, and may usually be increased up to a large hard-limit. ... If you system falls into 1 or 2 (above), then increase the file descriptor limit before starting Apache, using a script like #!/bin/sh . ...

... Regional planning meeting for the Balkan and Black Sea | ... Proposals for a web site of the Regional Network - Information on regional and global activities - Proceedings of this Meeting - Space Weather Alerts for the public - Form for submitting research and observational proposals - Database of scientific data publicly available - Greece provides solar telescope data - Romania provides data on active regions studied with helioseismis holography - Armenia provides access to...

Statistics of sunspot activity . The sunspot indices . ... The solar regions . ... 2015 . ... September . ... September, 2015 . Visual indices of solar activity by author's observations . ... Average . ... 0.40 . ...

... The Military Aspects of the Soviet Cosmonautics : A Side View . This book is the first effort in an unclassified Soviet publications to provide a comprehensive overview of the Soviet military space program. Presented here are the classification of the military space systems by functions performed (Chapter 1), the analysis of the organizational evolution of the Soviet space program (Chapter 2) and the description of all observable satellite systems of military or double destination (Chapter 3). ...

... Spherical aberration, coma, and astigmatism are also easily observed using the star test. ... Off-axis images are complex. ... Fig. ... Diffraction by a circular aperture as a function of defocus for no aberration Airy Disk 1 wave defocus Less than 1 wave defocus Fig. ... Diffraction by a circular aperture as a function of defocus for third-order spherical aberration Paraxial Focus Small distance inside paraxial focus Moderate distance from marginal focus Immediate neighborhood of marginal focus Fig...

... Contact A Problem of an estimation of accuracy of the asteroid CCD observations . The Minor Planet Center supported by the Interntional Astronomical Union is the main office for keeping observational data of the small Solar System bodies and their investigations. ... At Pulkovo Observatory we are estimating an accuracy of the CCD asteroid observations obtained by amateurs and professional astronomers all over the World using the MPC database. ...

... SRC "Planeta" is executing operative control and guidance management of ground system for receiving and processing satellite data that includes three regional centers: European Center (SRC "Planeta", Moscow, with branch offices in Obninsk and Dolgoprudny), Siberian Center (regional department in Novosibirsk) €а& Far-Eastern Center (regional department in Khabarovsk). ... Catalogues of received and processed satellite data are available on€а SRC "Planeta" web-sites: . SRC "Planeta" . ...

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... Antenna system . ... The Irkutsk incoherent scatter radar is one of the world's nine active radars which give the opportunity to investigate ionosphere by the incoherent scatter method. ... Antenna gain coefficient . ... Antenna . ... Two antennas . ... To get an idea what station "Dnepr" antenna system looks like, let us consider some of the radar views which are given by the photographs General view and Side view . ...

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