... Some existing (e.g., USNO-A1.0) and most of the upcoming catalogs (e.g., GSC-II SDSS , GAIA ) contain data for half a billion up to several billion objects. ... Here we present methods for structuring and searching very large catalogs to provide fast access to the coordinate domain of the parameter space. ... By generalising such methods it is also possible to produce catalog structures and indexes for accessing a multi dimensional parameter space. ...

... Home Observing This Month?s Sky This Monthт??s Sky т?? April 2016 . ... Lecture Series 2014-2015 . ... This Monthт??s Sky т?? ... This Month's Sky - 2015 . This Month's Sky - January 2015 . ... April 2015 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... I see the same problem all the time in undergraduate assignments: someone comes up with an answer that is clearly, wildly, hopelessly wrong (e.g. the mass of some star is 0.7 kg, or an asteroid is travelling at 1010 m s-1 (faster than light), or the Earth took 1011 years to form (much longer than the age of the universe). ... This means that every valid equation should work equally well, regardless of the units you use (as long as they are self consistent). ... Do you think this could be correct? ...

Excerpts from Peer Instruction for Astronomy Paul J. Green To be published by Prentice Hall 2002 Visit the Web site and ConcepTest Library at http://hea-www.harvard.edu/~pgreen/educ/PIA.html CONTENTS FOREWORD by Eric Mazur PREFACE Chapter 1: INTRODUCTION Chapter 2: PEER INSTRUCTION FOR ASTRONOMY ACTIVE ... Peer Instruction for Astronomy focuses on what instructors can do in class to boost student learning and satisfaction, and so the emphasis here is on informal learning groups. ...

TPOINT a telescope pointing analysis system Version 18.20, for Unix 10th December 2011 Published by: Tpoint Software www.tpsoft.demon.co.uk TPOINT is a trade mark. Information in this document is sub ject to change without notice. c Copyright 2011 P. T. Wallace. All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. CONTENTS iii Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .