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https://www.patreon.com/ulillillia --- Celestia is an open source project on Source Forge (https://sourceforge.net/projects/celestia/) that I tend to use for research purposes. Like, when Jupiter and Saturn came extremely close to each other, where, exactly were they in the sky, like, compass heading, and how much above the horizon? I used Celestia to get that info.
This time, I was using Celestia for details on how the right ascension and declination change with time for a fixed point in the scene, and for different points in the scene at the same time, hunting for patterns for formula acquisition. Thus, I recorded a video to show this, for the same 1-day period at 3 different locations (with focus mostly on latitude which affects the declination visibility). I also use 3 different viewing angles with a focus on north versus south where east and west are the same but simply reversed. This creates 9 varieties. Time is set to advance at 1000 times normal time and always uses the same 24-hour span of a given day.
The first is based on a 47.5°N latitude, which is about where I'm at. The second is at at 20°S latitude, which is about the northernmost point with Baricanna's 2.5D remaster's intent. The third is at 70°S latitude, right on Antarctica, near the pole. The facing directions used are due north (or exactly 0°), 60° (east-northeast), then 165° (south by east). The field of view is set very wide at 120° in this, which creates a lot of distortions (distortions that I can exactly calculate). From experiments and test cases that I've already done, I can exactly confirm that my infamous formula associated with parallax scrolling, "Pixels×Scaling = CU" is really true for actual 3D. 2 very different approaches return the same results and the same algorithms also work exactly the same in Celestia (or any 3D program for that matter). This video does not have any sound - I don't need any audio for what the intent of it is.
I'm needing the info for the dynamic day/night cycle I have planned for the 2.5D remaster of Baricanna, but also Galaxy Destroyers needs it as well.
From doing this, I really liked how well the day/night cycle showed up and, instead of just being a research project, I thought it would've been an interesting science-themed video, so I posted it.
Edit: corrections on the latitudes. Turns out, this is more complex than I expected. I'll need more test cases. I'm going as far as making several tables of figures to try to find patterns.