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Practical Astronomy with your Calculator, by Peter Duffett-Smith
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In its first two editions, Practical Astronomy With Your Calculator enjoyed tremendous success. Using clear and logical
- Sales Rank: #1015203 in Books
- Published on: 1988-03-31
- Original language: English
- Number of items: 1
- Dimensions: 8.98" h x .59" w x 5.98" l,
- Binding: Paperback
- 200 pages
About the Author
Peter Duffett-Smith is a physicist by training, and a radio astronomer by trade. He is a Reader in Experimental Radio Physics at the Cavendish Laboratory, University of Cambridge, and is a fellow of Downing College and the Royal Astronomical Society.
Most helpful customer reviews
27 of 27 people found the following review helpful.
This book is as beautiful as an astrolabe
By A Customer
For all stargazers who have university level math, and those equipped with lighter high school stuff, this book is a gem. In a few pages, and with nothing more than a pocket calculator, it allows you to explore the universe in a way which only a few hundred years ago was only possible with extensive state-support and massive buildings such as Stonehenge, state-sponsored observatories, and teams of pedantic astrologers and stargazers.
Starting from the simple building blocks (converting your local time to Universal time), it progresses to more and more complex calculations, until finally at the end, you can calculate eclipses and planetary orbits. All the formulas needed for doing this are given in the book, and explained in great detail with many diagrams. All relevant astronomical data is also given. And for every calculation, a sample example is carried out with real numbers, which you can trace along with, so by the end of it you understanding is complete, practically as well as theoretically.
A must read for any astronomy buff. I highly recommend it. It produces the information age equivalent of that feeling of satisfaction you get when you build a telescope and look out onto the heavens yourself--without any intermediaries. Astronomy and stargazing are the activities which were the genesis of the scientific revolution, more than 6000 years ago. This book shows you just how its done.
17 of 17 people found the following review helpful.
Excellent Value at $11.80
By Railbird
Amateur astronomers will be able to solve a multitude of practical problems with this book. If you are short on funds and have time to explore, this is the book for you. It is well organized and reasonably complete.
The extremely concise - bordering on laconic - style poses the danger that some readers may become discouraged and will give up. The low price makes it a tempting entry-level book, but the terse explanations means you'll have to do a lot of digging, which is a cookbook recipe to discourage newcomers to a field.
I have two critiques of this otherwise excellent work.
1.) The formulae presented in this book are a little too "cookbook" in for my tastes.
2.) Further they are only weakly validated, so it is difficult to know how accurate the results are.
The cookbook nature provides little insight into the physical problem being solved. It did motivate me to buy and study Smart's "Spherical Astronomy". If you want more than superficial answers, you'll need to dig deeper.
Validation is rarely a problem for amateurs. Most people who buy this book will program the recipes on their home computers. (Most are readily amenable to treatment in spreadsheets.) So far, no problem. But how do you know whether or not your calculation of the position of Mars 60,000 ago is any good?
I think that Meeus and Montenbruck largely avoid these problems, but at a much higher selling price.
*****
UPDATE: They must have read my review! There is a new version of this book by Cambridge Press and a website from which you can download spreadsheets implementing at least some of the algorithms. You do not have to buy the book to download the spreadsheets, but if you can afford the book, you shouldn't be a free loader. I did download a couple of the spreadsheets to check them out. I had some stylistic issues initially, a kind of "that's not how I would have done it" reaction. On second thought, from a purely diadatic prespective, their approach is better. I tested the accuracy of solar ephemerides for the next 400 years, and they agree with JPL Horizons to within 0.0055 degrees RMS. If you need better than that, you shouldn't be using a spreadsheet. I found I could reduce the disagreement to less than 0.0014 degrees RMS by adding a term to account for the 18.60 year precession of the lunar nodes. I hardly recommend trying to improve it, it is more than adequate as is. I will review the new book once I've had more time to study it.
Since I broached the topic, I'll supply the formula for the correction to the spreadsheet SunPos:
e = Ao*sin( 6793/2/pi()*T + phi)
Ao = 0.004119054
T = days since Jan 1, 2000 00h UTC
phi = 3.593663052
It's not worth doing, but I did it anyway. I've only done a fit over the period 2000 AD to 2400 AD.
17 of 17 people found the following review helpful.
Nice at twice the price
By Rick
Don't be misled by the title. The recipes supplied by Peter Duffett-Smith are aimed at making calculations easier with a hand held calculator. However they are easily adapted for creating utilities on personal computers. The material should be easily handled by anyone whose completed highschool algebra and some trigonometry.
The organization and format is well thought out. The earliest chapters deal with time and coordinates which are used in the more complex problems such as computing planet positions later in the book.
Each concept is explained in straight forward language and conventional algebraic formulas are supplied. I found this especially useful for programmers using higher languages such as C,Pascal or Java. Then a step by step practical example is provided that is suitable for a scientific hand calculator. Duffett-Smith is careful about displaying units; a mindfield for most scientific calculations.
My only minor criticism is that some of the typos errors could leave a user quite frustrated. On pp108 I found the value of Tp=0.240850 gave the correct answer while the tabulated value is 0.240852. Similarly, I on page 129, after repeated checks, I got a value of 7.08...AU for Rho compared with the value of 8.13AU in the book. The text cites a 7.2AU value from the Astronomical Almanac.
Otherwise this is one neat addition to the bookshelf of any amateur astronomer of individual interested in astromical calculations.
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