Popular All Time

Pardon My French
Walking to Samarkand
True North
World Travel
Rick Steves Italy
Rick Steves Iceland
Road to Hana : R2H AUDIO GUIDE
DK Eyewitness Southwest USA and National Parks
Maui Revealed
Leave Only Footprints
A Walk in the Woods
Iceland Travel Guide
I'm Off Then
John Muir: Wilderness Essays, Environmental Studies, Memoirs & Letters  (Illustrated Edition)
Moon Southwest Road Trip
Under the Dragon
The Innocents Abroad
Look Up, Minneapolis! A Walking Tour of Minneapolis, Minnesota
The Route 66 Photo Road Trip: How to Eat, Stay, Play, and Shoot Like a Pro
Rick Steves Snapshot Sevilla, Granada & Andalucia
Rough Guide to Japan (Travel Guide eBook)
Fodor's Napa & Sonoma
Moon Michigan's Upper Peninsula
USA National Parks
Rick Steves Portugal
Not For Tourists Guide to Seattle 2017
A Year in Provence
Everything Now
The Deepest South of All
Rick Steves Rome

Recent Books

Das E-book: Mehr als nur ein wenig praktischer
Authors: Gregor Schönfelder - Categories: Computers - Published: 2012-10-16
Smart Data Analytics
Authors: Andreas Wierse, Till Riedel - Categories: Technology & Engineering - Published: 2017-06-26
Instagram
Authors: Markus Fasse - Categories: Computers - Published: 2019-01-22
MongoDB kompakt
Authors: Johannes Schildgen - Categories: Computers - Published: 2016-04-11
Print Is Dead
Authors: Jeff Gomez - Categories: Computers - Published: 2008
Wirtschaftsinformatik
Authors: Hans Robert Hansen, Jan Mendling, Gustaf Neumann - Categories: Business & Economics - Published: 2019-01-29
Scrum – Einführung in der Unternehmenspraxis
Authors: Dominik Maximini - Categories: Business & Economics - Published: 2018-01-24
Praxishandbuch IT-Kommunikation
Authors: Sandra Aengenheyster, Kim Miriam Dörr - Categories: Business & Economics - Published: 2019-01-07
Keine Angst vor UNIX/Linux
Authors: Christine Wolfinger - Categories: Computers - Published: 2013-03-07
Life 3.0
Authors: Max Tegmark - Categories: Technology & Engineering - Published: 2017-08-29

Astronomy Now

This month he looks at how you can star test your optics . ... he ultimate telescope would have no optical aberrations , a tiny secondary mirror and ...

Astronomy Now


Star Ware

Test. Your. Telescope. There is no way to guarantee that every telescope ... 1Suiter, H.; Star Testing Astronomical Telescopes; Willmann-Bell, Inc., 1994.

Star Ware


Advanced Amateur Astronomy

mirror / objective flooded with light from the test - star . If you move the telescope very slightly so that the blade begins to cut off the light you will ...

Advanced Amateur Astronomy


Southern Stars

Star Testing Astronomical Telescopes : A Manual for Optical Evaluation and Adjustment Harold Richard Suiter Willman - Bell Inc . , PO Box 35025 , Richmond ...

Southern Stars