I stumbled onto a nice feature of the points generating code. If you enter the declination as 90.00 degrees and the altitude as some latitude, then the points generated will draw a line of latitude. It makes sense. If polaris which is basically declination 90.00 degrees is observed at your latitude, the observed altitude of polaris will be your latitude.
I’ve been reading about the history of celestial navigation and got to the part about Sumner and lines of position and using the transit of a body across the local meridian as a way to check chronometers. So, I used ICE to calculate the transit of the sun. I then picked 1 hour before transit, time of transit and 1 hour after. I got three circles of position, with transit being the smallest. I thought it was interesting that it shows that the sun at local noon(transit)is at the highest altitude and the two circles preceding and following have equal altitudes and are bigger than transit because the alttiude is lower. It just illustrates what these circles are in a clear way.
Finally, just out of curiosity if I can draw a latitude line, can I also draw a longitude line. If I subtract my longitude from 90 degrees and set declination to 0 degrees and altitude also to 0 degrees, then yes.
