“The Practical Astronomer’s Deep-sky Companion” by Jess K. Gilmour is a comprehensive textbook focusing on the subject areas of nature and science, with a specific emphasis on astronomy. Published by Springer London, The Limited in 2002 as part of “The Patrick Moore Practical Astronomy Ser,” this trade paperback book provides valuable insights and information for sky observation and astronomy enthusiasts. With 146 pages filled with expert knowledge and practical tips, this companion is a must-have for anyone interested in exploring the wonders of the deep sky.