Open curriculum · No prior knowledge assumed
Astronomy, maths and physics from a standing start. You predict first, run second, and then go outside and find out whether reality agreed with you.
The method
Every lesson makes you commit to an answer before it shows you one. Then it makes you check that answer against the actual sky, and explain the gap.
The gap is the point. A model that agrees with reality teaches you one thing; a model that disagrees, and tells you why, teaches you how modelling works.
Nothing here assumes an assistant. The struggle is not an obstacle in front of the learning; it is the learning.
Standard library only. Every formula is readable, and installation almost cannot fail.
No assumed hemisphere, country, daylight saving, or access to a coastline.
Every model says what it assumes and where it breaks. The tide model is deliberately inadequate, and explains why.
Curriculum
Every written module is readable here, in full, with nothing to install. Start at the beginning, or pick a module.
Try it without installing anything
Latitude is a morning's work. Longitude took two centuries and cost thousands of lives. Find out why, and then set a clock that drifts four seconds a day, sail for two months, and see which coast you hit.
Start
Then open your first command and make a prediction before you run it. If you would rather read before installing anything, the whole curriculum is here in your browser.
Not for navigation. Moonfield is a teaching tool. Its tide model in particular is wrong by hours and metres, on purpose, and the curriculum explains exactly why.