An ancient calendar based on the cycles of the sun and moon. The red arrow shows the current position of the Sun on the celestial sphere. The blue arrow is the moon. The sidereal sign of the zodiac is used, that is, the real position of the planets in the constellations is indicated. When the arrows meet each other - this is a new moon. And when the arrows are opposite each other - this is a full moon. The black cross in the center is a solar cross showing the equinoxes and solstices, the beginnings of spring, summer, autumn and winter.