🌞 Gnomon Sun Path and Analemma Lab: Day Length, Noon Altitude and Shadow by Latitude and Date

A stone sundial in a courtyard with a real moving shadow: set latitude, date and time and see the Sun's daily arc, the solstice and equinox arcs, the figure-8 analemma and the shadow-tip curve. Change axial tilt or orbital eccentricity to see why seasons and the equation of time exist; day length and daily sunlight are checked against independent formulas.