Download the Practical Astronomy book by George L. Hosmer, This is a text in practical astronomy particularly adapted to the requirements of civil-engineering students who will devote however little time to the topic, and who are not likely to require up advanced study of astronomy. The text deals in the main with the category of observations which can be created with surveying instruments, the methods applicable to astronomical and geodetic instruments being treated briefly. Download the pdf from below to explore all topics and start learning.