What is the significance of the glyph in the Mayan calander?

Tonatiuh's Face is of the sun. Lord of heavens, around which takes place all daily and periodic phenomena. The crown, nose piercing, ear piercing and necklace. The hair is blond, due to the color of the sun. The wrinkles on the face show experiance and wisdom. And the tongue, stuck out is the form of a knife, indicating the demands to be replenished with blood and human sacrafice.