The Museum of Modern Art describes this calendar format as “wildly popular” and perhaps you can see why — astronomy adds an extra layer of interest to your day-to-day schedule. It's a poster-format 2025 calendar printed using an elaborate production process with black and metallic inks (so the different moon phases really shimmer) on silk-finished paper stock. And at almost three feet wide, it'll look almost like an art piece hung on your wall.