Fontoura da Costa, A. “Astronomical Fixes by Azimuth — Astronomical Fixes by Simultaneous Altitude and Azimuth of the Sun - Radiogoniometric Fixes for Distances Nearer the Station”. The International Hydrographic Review, no. 2 (May 30, 2018). Accessed June 18, 2024. https://journals.lib.unb.ca/index.php/ihr/article/view/27589.