The Moon Calendar 2025 renders each day of the year as a small orthographic projection of the Moon’s phase using d3.geoPath and d3.geoOrthographic. Days are arranged in a grid by month along the y-axis and day of month on the x-axis, with axes labeled via d3.axisTop and d3.axisBottom. The phase is computed from a simple lunar period formula using timestamps. Clicking any point triggers a red expanding circle animation via transition, highlighting today’s position.