A semi-shadow lunar eclipse will occur in Saudi Arabia and the Arab region on Friday.
The celestial phenomenon, also known as penumbral lunar eclipse, will also be visible in most Arab countries.
Saudi Astronomical Society president Majid Abu Zahra said the eclipse would last four hours and four minutes.
A penumbral lunar eclipse happens when the moon moves through the faint, outer part of Earth’s shadow, which causes the moonlight to decrease slightly but the disk of the moon will remain fully lit during the eclipse.
The semi-shadow will begin on Friday at 8.08pm (5.08pm GMT) when the moon starts entering the penumbra zone.
“Sky gazers watching the celestial event will not see any change in the lighting of the moon disk at this stage,” said Mr Abu Zahra.
He said the eclipse would reach its peak at 10.10pm (7.10pm GMT). The moon will then reach the full moon phase at 10.21pm (7.21pm GMT), which is the first of three full moons in the winter season in the north hemisphere.
The penumbral eclipse will end at 12.12am (9.12pm GMT) with the moon leaving the semi-shadow of the earth. Another semi-shadow eclipse will happen on June 6 and will be visible in Saudi Arabia and the Arab region.
Two other penumbral lunar eclipses will also happen on July 4-5 and November 29-30.