Apply equation of Time to get the corresponding G.A.T. 3. Correct observed altitude to get T.C.A. Also have at hand Lat.
"Lectures in Navigation"
Ernest Gallaudet Draper
Page 70, equation originally multi-line fraction, rendered into one line for clarity.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
The equation seemed undisturbed, yet there was something wrong with it.
"Eight Keys to Eden"
Mark Irvin Clifton