Sunday , January 24 2021

Friday .. the last quarter of the month in the skies of the Arab world



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

The moon is revealed high in the dome of the sky along with the beginning of sunrise, on Saturday, against the blue sky and will remain visible until it sets at noon according to local time.

It is known that the moon revolves around the earth once every four weeks, and the result is a cycle of phases from conjunction, crescent beginning of the month, first quadrature, through increasing hump, then full moon, then smaller humps, then the last quarter and end of the crescent and returns to conjunction again every 29.5 days, This movement also means that the moon moves rapidly in the sky, from one night to another, the moon exceeds 13 degrees in the dome of the sky, and this makes the moon rise and set about an hour late every day .

The last quadrature period is considered, half of the moon and the other half appear dark, ideal time to observe the topography of the lunar surface with binoculars or a small telescope, because mountains, craters, etc. are very clear, especially along the line separating the light side from the dark side due to light interference and shadow, which gives a 3D view, ideal for surveillance 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 decrease until the moon at the end of the month becomes crescent and observes it just before sunrise, preparing for its fall in conjunction with Rabbi al-Awwal 1441.


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