ABU SIMBEL, Egypt — Hundreds of tourists from around the world and locals gathered at dawn Thursday at a temple in southern Egypt, with some sleeping outside it overnight to witness a solar phenomenon that has taken place here for millennia.

Twice a year, on Oct. 22 and Feb. 22 — dates believed to mark the ascension of Ramesses II to the throne and his birthday — the sun sends a beam of light into the Great Temple of Ramses II’s dark inner chamber to illuminate the statues of the pharaoh and two gods beside him.

The illumination, a result of the temple’s alignment with the sun, lasts about 20 minutes.

“Today is a very special day, as you can see. It’s a celebration and a historic holiday,” Hisham Khela, a local tour guide for Italian tourists, told The Associated Press.

Egyptology enthusiasts and other visitors stood in a messy single-file line with phone cameras in hand, some with selfie sticks and most with bags under their eyes from waking up so early. Although huge crowds turned up, they looked tiny beside the giant statues lining the temple, which overlooks the Nile.

To mark the phenomenon, colorfully dressed performers scattered in front of the temple smiled and danced in unison to meditative chimes, the percussion of the tabla and the distinct sound of mizmars, an ancient Egyptian trumpet.

Inside the temple, visitors huddled tightly in near-total darkness in front of the statues of Ramesses II and the gods Amun-Ra and Ra-Horakhty, lit by a beam of sunlight that traveled about 60 meters (200 feet) into the temple, according to the National Research Institute of Astronomy and Geophysics.

For first timers, ancient history created modern memories.

Janice Souudi, who traveled from Atlanta, Georgia, said it was her first time in Egypt, and she said it won’t be her last.

“I came here today for the huge temple statues and how well preserved they are. But I was most impressed with the colors of the carvings and hieroglyphics and imagery,” she said. “Beautiful, stunning, worth it!”

In the 1960s, archaeologists carried out a massive project to dismantle and relocate the temple, moving it out of the path of rising waters created by the Aswan High Dam.

Engineers took care to preserve the temple’s alignment with the sun, so that more than 3,000 years after it was built, the light still finds its way inside.