I like this book, because it is very practical, well structured and easy to use.
Inside 'Practical Astronomy with your calculator' you can find all the most common practical
problems of astronomy and ready to use recipes of how to calculate and find the solutions to
these problems. The best thing of it all is that it can all be done with a rather simple, but
modern calculator that includes trigonometric functions. This means that no complex derivatives,
integration or programming is needed!
I tried for example to calculate my local sidereal time (or 'star time') here in Denmark at any
date and time of the year. Then I double checked the results with online 'astronomical watches'
and it all fit very well....
Try to calculate any of the astronomical relations yourself and you will know what I mean!