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por A. Richard Thompson

This book is open access under a CC BY-NC 4.0 license.
The third edition of this indispensable book in radio interferometry provides extensive updates to the second edition, including results and technical advances from the past decade; discussion of arrays that now span the full range of the radio part of the electromagnetic spectrum observable from the ground, 10 MHz to 1 THz; an analysis of factors that affect array speed; and an expanded discussion of digital signal-processing see more techniques and of scintillation phenomena and the effects of atmospheric water vapor on image distortion, among many other topics.
With its comprehensiveness and detailed exposition of all aspects of the theory and practice of radio interferometry and synthesis imaging, this book has established itself as a standard reference in the field. It begins with an overview of the basic principles of radio astronomy, a short history of the development of radio interferometry, and an elementary discussion of the operation of an interferometer. From this foundation, it delves into the underlying relationships of interferometry, sets forth the coordinate systems and parameters to describe synthesis imaging, and examines configurations of antennas for multielement synthesis arrays. Various aspects of the design and response of receiving systems are discussed, as well as the special requirements of very-long-baseline interferometry (VLBI), image reconstruction, and recent developments in image enhancement techniques and astrometric observations. Also discussed are propagation effects in the media between the source and the observer, and radio interference, factors that limit performance. Related techniques are introduced, including intensity interferometry, optical interferometry, lunar occultations, tracking of satellites in Earth orbit, interferometry for remote Earth sensing, and holographic measurements of antenna surfaces.
This book will benefit anyone who is interested in radio interferometry techniques for astronomy, astrometry, geodesy, or electrical engineering.

por DK

Since the dawn of humankind, people have looked upward to the heavens and tried to understand them. This encyclopedia takes you on an expedition through time and space to discover our place in the universe.

We invite you to take a journey through the wonders of the universe. Explore the cosmos, from planets to black holes, the Big Bang, and everything in-between!


Get ready to discover the story of the universe one page at a time! This educational book for young adults will see more launch you on a wild trip through the cosmos and the incredible discoveries throughout history.

Filled to the brim with beautifully illustrated flowcharts, graphics, and jargon-free language, The Astronomy Book breaks down hard-to-grasp concepts to guide you in understanding almost 100 big astronomical ideas.

Big Ideas

How do we measure the universe? Where is the event horizon? What is dark matter? Now you can find out all the answers to these questions and so much more in this inquisitive book about our universe!

Using incredibly clever visual learning devices like step-by-step diagrams, you'll learn more about captivating topics from the Copernican Revolution. Dive into the mind-boggling theories of recent science in a user-friendly format that makes the information easy to follow.

Explore the biographies, theories, and discoveries of key astronomers through the ages such as Ptolemy, Galileo, Newton, Hubble, and Hawking.

To infinity and beyond! Journey through space and time with us:

- From Myth to Science 600 BCE - 1550 CE
- The Telescope Revolution 1550 - 1750
- Uranus to Neptune 1750 - 1850
- The Rise of Astrophysics 1850 - 1915
- Atom, Stars, And Galaxies 1915 - 1950
- New Windows on The Universe 1950 - 1917
- The Triumph of Technology 1975 - Present

The Series Simply Explained

With over 7 million copies sold worldwide to date, The Astronomy Book is part of the award-winning Big Ideas Simply Explained series from DK Books. It uses innovative graphics along with engaging writing to make complex subjects easier to understand.

Shortlisted:

A Young Adult Library Services Association Outstanding Books for the College Bound and Lifelong Learners list selection

A Mom's Choice Awards® Honoring Excellence Gold Seal of Approval for Young Adult Books

A Parents' Choice Gold Award winner

por Book 3

This non-fiction short-form eBook features content which is adapted from the audiobook Harry Potter: A History of Magic - inspired by the British Library exhibition of the same name.

If you've gazed into the crystal ball you'll have seen that you are about to enter a place of prediction and fortune-telling that makes up the subject of Divination in the real and wizarding world. From the use of bones and shells thousands of years ago, to peering into teacups in the parlours of see more Victorian England, for millennia people have strived to see what fate and fortune holds. Trying to read our destinies, the study of the night sky has fascinated people for centuries, from the star atlases of ancient China to the celestial globes of 17th-century Venice. Astronomy holds a special place in the wizarding world as a source of inspiration and identity for Harry Potter's life at Hogwarts, and beyond.

This eBook short examines the colourful characters and curious incidents of the real history of magic, and how they relate to the Hogwarts lesson subjects of Divination and Astronomy.

The history of magic is as long as time and as wide as the world. In every culture, in every age, in every place and, probably, in every heart, there is magic.

por Douglas J Alford

Why are there 7 days in a week and 12 months in a year?  What do stars have to do with it?  Long ago, people looked up at the night sky.  They made up stories to explain the speckled dots of lights.  The ancients divided up the year into weeks and days.  They assigned “stars” to days and groups of stars to months.  We may not know all their stories and beliefs, but we still tell time the same way.  Inside this book are the reasons why. 

por Baby Professor

A 5th grader needs as much as “reinforcements” when it comes to studies. It is best if you can complement the official textbooks with refreshing resources but you don't want to overdo it. You want your child to stay focused but the same time, still interested in studying. That’s why you should choose the educational resources you buy carefully. Choose this book today.

por Philip C. Plait

Advance praise for Philip Plait s Bad Astronomy

"Bad Astronomy is just plain good! Philip Plait clears up every misconception on astronomy and space you never knew you suffered from." --Stephen Maran, Author of Astronomy for Dummies and editor of The Astronomy and Astrophysics Encyclopedia

"Thank the cosmos for the bundle of star stuff named Philip Plait, who is the world s leading consumer advocate for quality science in space and on Earth. This important see more contribution to science will rest firmly on my reference library shelf, ready for easy access the next time an astrologer calls." --Dr. Michael Shermer, Publisher of Skeptic magazine, monthly columnist for Scientific American, and author of The Borderlands of Science

"Philip Plait has given us a readable, erudite, informative, useful, and entertaining book. Bad Astronomy is Good Science. Very good science..." --James "The Amazing" Randi, President, James Randi Educational Foundation, and author of An Encyclopedia of Claims, Frauds, and Hoaxes of the Occult and Supernatural

"Bad Astronomy is a fun read. Plait is wonderfully witty and educational as he debunks the myths, legends, and 'conspiracies that abound in our society. 'The Truth Is Out There' and it's in this book. I loved it!" --Mike Mullane, Space Shuttle astronaut and author of Do Your Ears Pop in Space?

por Carolyn Collins Petersen

Explore the curiosities of our galaxy with this comprehensive, digestible guide to astronomy!

Too often, textbooks obscure the beauty and wonder of outer space with tedious discourse that even Galileo would oppose. Astronomy 101 cuts out the boring details and lengthy explanations, and instead, gives you a lesson in astronomy that keeps you engaged as you discover what's hidden beyond our starry sky.

From the Big Bang and nebulae to the Milky Way and Sir Isaac Newton, this see more celestial primer is packed with hundreds of entertaining astronomy facts, charts, and photographs you won't be able to get anywhere else.

So whether you’re looking to unravel the mystery behind black holes, or just want to learn more about your favorite planets, Astronomy 101 has all the answers—even the ones you didn’t know you were looking for.

por Douglas J. Alford

Why are there 7 days in a week and 12 months in a year?  What do stars have to do with it?  Long ago, people looked up at the night sky.  They made up stories to explain the speckled dots of lights.  The ancients divided up the year into weeks and days.  They assigned “stars” to days and groups of stars to months.  We may not know all their stories and beliefs, but we still tell time the same way.  Inside this book are the reasons why! 

por Douglas J Alford

Why are there 7 days in a week and 12 months in a year?  What do stars have to do with it?  Long ago, people looked up at the night sky.  They made up stories to explain the speckled dots of lights.  The ancients divided up the year into weeks and days.  They assigned “stars” to days and groups of stars to months.  We may not know all their stories and beliefs, but we still tell time the same way.  Inside this book are the reasons why. 

por Douglas J Alford

Why are there 7 days in a week and 12 months in a year?  What do stars have to do with it?  Long ago, people looked up at the night sky.  They made up stories to explain the speckled dots of lights.  The ancients divided up the year into weeks and days.  They assigned “stars” to days and groups of stars to months.  We may not know all their
stories and beliefs, but we still tell time the same way. 
Inside this book are the reasons why.