The "Pyramid of the Moon" in Teotihuacan, an ancient city in Mexico, may align with the solstice sun, a team argues.

The first day of spring, also known as the vernal equinox, has arrived in the Northern Hemisphere on March 20, 2025.

The Pyramid of the Sun was built approximately in 100 CE. It is under continuous research as archaeologists and historians continue to understand more about it.

Object Details Description Mexican first day of issue cover, Scott 1001; with two circular cancels and straight bar cancel to the right; multicolor cachet on left with image of the stamp Date October ...

Early 1900s excavations and subsequent digs have uncovered mica-lined chambers not only in the Feathered Serpent Pyramid but also in the Pyramid of the Sun nearby and throughout the city.

Towering at the northern end of the Avenue of the Dead, the Pyramid of the Moon—second only to the colossal Pyramid of the Sun in both scale and mystique—was built between 200 and 450 A.D. and ...