Friday .. the last quarter of the moon in the sky of the Arab world


The moon lights up, before midnight, today, Friday 9 October 2020, followed by a moment Last square At 02:39 AM local time in Cairo (00:39 AM GMT), thus cutting three-quarters of its orbit around the Earth during the month.

The moon is observed high in the dome of the sky to coincide with the onset of sunrise, Saturday, against the background of the blue sky, and will remain visible until it sets at noon according to local time.

The moon is known to revolve around the earth once every four weeks, and the result is a cycle of its phases from the conjunction, the crescent of the beginning of the month, the first square, through the crescent hunchback, then the full moon, and then the decreasing hump, then the last quarter and the end of the rising month, and returns to the conjunction again every 29.5 days.This movement also means that the moon is moving rapidly across the sky, from one night to the next night, the moon crosses 13 degrees in the dome of the sky, and this causes the moon to rise and set about an hour late each day.

Considering the last period of quadrature, half of the moon and the other half appear dark, the ideal time to observe the topography of the lunar surface with binoculars or a small telescope, because the mountains, craters, etc. They are very sharp, especially along the line that separates the light side from the dark side for the interference of light and shadow, which gives 3D view, ideal for monitoring and photography.

According to the Astronomical Society of Jeddah, in the next few days, the distance between the moon and the sun in the dome of the sky will reduce until the moon becomes in the waxing phase at the end of the month and will be observed just before sunrise in preparation for the its fall in the conjunction of the month of Rabi ‘al-Awwal 1441.

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