NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2022 Jun 30, 13:51 -0700
Sorry
All those cosine graphics wore me out. My last message should have read:
Frank Reed you wrote: In the tropics and assuming declinations in the Sun's range, the rising azimuth of a body is very nearly 90°-Dec (where Dec is signed), and the setting azimuth is nearly 270°+Dec.
So, latitude zero, declination zero, azimuth at sunrise = 090°. That figures. It is also confirmed by the Amplitude Tables. The difference between amplitude and declination gradually increases as declination and latitude increase although interestingly the percentage difference for a particular latitude stays about the same for any declination. E,g. at 23.5° declination and 23.5° latitude the difference is 2.3° or 9.8%. At 10 declination and 23.5° latitude it’s 0.95° or 9.5%. I blame electronic calculators. DaveP
