Sky & Telescope - February 2016 (gnv64) torrent

Sky & Telescope - February 2016
English | True PDF | 82 Pages | 28.4 mb

On the cover: Our galaxy’s center is a crowded, exciting place, with a black hole, speedy stars and gas clouds, and many mysteries.
FEATURES
16 Into the Heart of the Milky Way
When astronomers tuned in to watch our galaxy’s supermassive black hole feed, they found more (and less) than they expected. By Daryl Haggard & Geoff rey Bower
24 The Astrolabe: Astronomy’s First Hot App
Loaded with features, an ancient analog computer mimics the sky’s workings. By Bruce Watson
28 A Trip to the Northern Frontier
The celestial arctic awaits your arrival. By Steve Gottlieb
OBSERVING FEBRUARY
37 In This Section
38 February’s Sky at a Glance
39 Binocular Highlight By Gary Seronik
40 Planetary Almanac
41 Northern Hemisphere’s Sky By Fred Schaaf
42 Sun, Moon & Planets By Fred Schaaf
44 Celestial Calendar By Alan MacRobert
48 Exploring the Moon By Charles A. Wood
50 Deep-Sky Wonders By Sue French
53 Going Deep By Richard Jakiel
S&T TEST REPORT
56 Nikon D810A Camera By Jerry Lodriguss
ALSO IN THIS ISSUE
4 Spectrum By Peter Tyson
6 Letters
8 75, 50 & 25 Years Ago By Roger W. Sinnott
10 News Notes
34 Telescope Workshop By Gary Seronik
62 New Product Showcase
64 Book Review By S. N. Johnson-Roehr
66 Gallery
76 Focal Point By Dean Regas