Astronomy Picture of the Day - 2017 July 3 - The Summer Triangle over the Great Wall

apod (46)in #science • 7 years ago

Astronomy Picture of the Day

Each day a different image or photograph of our fascinating universe is
featured, along with a brief explanation written by a professional astronomer.

2017 July 3

The Summer Triangle over the Great Wall
Image Credit & Copyright: Steed Yu & NightChina.net

Explanation

Have you ever seen the Summer Triangle?

The bright stars Vega, Deneb, and Altair form a large triangle on the sky that can be seen rising in the northern spring during the morning, and rising in the northern fall during the evening.

During summer months, the triangle can be found nearly overhead near midnight as three of the brightest stars on the sky. Featured here, along with the arch of the central band of our
Milky Way Galaxy, the Summer Triangle asterism was captured this spring over the Great Wall of China.

This part of the Great Wall, a World Culture Heritage Site, was built during the
6th century on the Yan Mountains. At the summit is Wangjinglou Tower from which, on a clear night, the lights of Beijing are visible in the distance.