Duffett-Smith, Peter. <br/><br/>
Practical astronomy with your calculator / 
Peter Duffett-Smith. 
 - 2nd ed. 
 - Cambridge :  Cambridge University Press,  1981. 
 - xvi, 188 p. :  ill., 1 map ;  21 cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>052124059X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy--Problems, exercises, etc.<br/>Calculating--machines.