Practical Astronomy with your Calculator or Spreadsheet
"This beautifully produced, ring-bound book, now in its fourth edition, is a real reference gem for any astronomer or student. It contains just about all the maths you'd ever need for astronomical applications, presented in an exquisitely clear manner."John Rowlands, Astronomy Now magazine"..this book does a good job at what it sets out to do.  The formulas and algorithms are presented clearly and with an appropriate level of detail, and the spreadsheets supplement the text by showing an additional way to perform the computations without having to resort to a scientific calculator or writing your own programs." - Michael Coren, reviewer, cloudynights.com