Looking for the Wndsn store? This way, please.
Companion to Wndsn Quadrant Telemeters: Low tech, high utility graphical distance computers from the Wndsn applied science lab.
By way of using a Wndsn Quadrant to measure local latitude and calculate declination for a given date, a number of values can be derived through further Quadrant computations.
The celestial sphere and the navigational triangle with all relevant variables.
The equations are proof-of-concept formulas and ignore specifics like atmospheric refraction, etc. The calculated results are FOR EDUCATIONAL PURPOSES ONLY; some are exact, some are approximate, and some are simplified. Actual Sun data may vary significantly.
The display precision set is
.2. To change that, edit the variable
&digits=x in the URL where
0 <= x <= 9.
H = (90° − φ) + δ
cos αsr = sin δ / cos φ
cos tsr = -tan φ * tan δ
cos t = (sin h - sin δ * sin φ) / (cos δ * cos φ)
tan αs = (sin t / (sin φ * cos t)) - cos φ * tan δ
where H = Sun altitude at noon, h = instantaneous Sun altitude, t = hour angle, φ = latitude, and δ = declination.