Thread | Brutkey

That's better (and actually usable for measuring Hc and Zn for a given latitude, declination and LHA)

chart with a compass rose and lines indicating the height of a celestial body based on the other three parameters.

Expanding the declination range to +/-60 and the LHA to +/-180 makes the globe more obvious and shows the polar regions.

twelve circular plots that are beginning to approximate spheres with lines of latitude and meridians of longitude

Trammell Hudson
@th@social.v.st

Friends don't let friends mix degrees and radians.

a chart that is completely covered in black lines since the diagrams are spinning around way too fast since degrees are so much larger than radians.

Trammell Hudson
@th@social.v.st

Since the Zn result is symmetric around LHA and it is important to have a higher-accuracy on the Hc height, I've split the chart into two so they can be read separately

two circular charts, one with something that looks sort of like a globe and the other with a curving plot that relates the declination and local hour angle of a celestial body to its computed height

Trammell Hudson
@th@social.v.st

The goal is to replace the six pages per latitude of the Pub 249 sight reduction tables with a single chart that can be printed two to a page.

Nautical almanac open to a page full of numbers with a printed circular chart in front of it and a circular slide rule as well.