What does Analemma mean? If you'd take a photo of the sun and sky at the same time (usually taken at noon) and the same spot all throughout the year ... ... <看更多>

Exploring the analemma with Three.js. (See a live version here). What is the equation of time? The earth's orbit is not perfectly circular, but elliptical, ... ... <看更多>

It is correct that the Earth's axial tilt alone would result in an analemma of a figure of eight with equally sized lobes. ... <看更多>