Greece Lunar Eclipse

Full moon rises over the ancient temple of Poseidon in cape Sounio, about 40 miles south of Athens, Friday, July 27, 2018. The complete lunar eclipse Friday when the sun, Earth and moon line up perfectly to cast Earth's shadow on the moon, will be the longest this century. It's called a "blood moon" because it turns a deep red and will be visible at different times around the world. Additionally, Mars and the sun will be on exact opposite sides of the Earth and will shine its best. (AP Photo/Thanassis Stavrakis)

JOHANNESBURG (AP) — Skywatchers around much of the world have begun watching a complete lunar eclipse that is the longest of this century.

The so-called "blood moon," when it turns a deep red, is visible at different times in Australia, Africa, Asia, Europe and South America when the sun, Earth and moon line up perfectly, casting Earth's shadow on the moon.

The total eclipse lasts 1 hour and 43 minutes, with the entire event lasting closer to four hours.

Across Africa people turned to the sky. In Johannesburg, residents took advantage of the clear winter night and watched the reddish shadow slide up the moon's surface.

"The reason that the moon turns red is because atmospheric scattering causes red light to pass through the atmosphere and the composition of the atmosphere can change if volcanic eruptions or forest fires occur," said Tom Kerss, an astronomer with the Royal Observatory Greenwich.

"And the density of dust increasing in the atmosphere can cause the moon to appear a particularly deep red, and indeed it has the same effect on our sunsets and sunrises."

In a special treat, Mars is also at its closest approach to Earth this week since 2003, making it appear bigger and brighter.

Excited skywatchers on social media shared photos of the bright planet just to the right of the moon.

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