بدأ فصل الخريف فلكيًا، عند الساعة 04:31 من مساء يوم غدٍ الثلاثاء بتوقيت القدس، مع توقعات بتراجع في درجات الحرارة بشكل بطيء ابتداءً من اليوم الاثنين.
وقالت الجمعية الفلكية الفلسطينية، اليوم، إن فصل الخريف سيستمر 89 يومًا، و20 ساعة، و32 دقيقة، على أن يبدأ فصل الشتاء فلكيًا، في 21 ديسمبر/ كانون أول.
وستُشرق شمس يوم الاعتدال الخريفي في القدس غداً في تمام الساعة 06:27 من الزاوية الشرقية تماما.
وبيّنت أن الاعتدال الخريفي يحل عندما تكون الشمس عمودية تماماً على خط الاستواء، وفي هذا اليوم ينتهي فصل الصيف.
وأشارت إلى أن مدة ليل الخريف سيكون 11 ساعة و52 دقيقة و4 ثواني، بينما تكون مدة النهار 12 ساعة و7 دقائق و56 ثانية.
ويعد الاعتدال الخريفي من الظواهر الفلكية التي يتسبب في حدوثها ميلان محور دوران الأرض حول نفسها بمقدار 23.5 درجة ودورانها المتواصل حول الشمس.
وعندما يحدث الاعتدال يتحد ميلان محور الأرض ومدارها حول الشمس بحيث أن محور دوران الأرض حول نفسها لا يكون مائلا بعيدا عن الشمس ولا يكون مائلا باتجاهها.
وإثر هذه الظاهرة، فإن النصف الشمالي والجنوبي من الأرض يستقبلان أشعة الشمس بشكل متساوي ويكون الليل والنهار تقريبا متساويان من حيث الطول، وفق بيان “الجمعية الفلكية”.
واستطردت : “لكن نظرا لأن الأرض لا تتوقف أبدا في حركتها حول الشمس فان هذا التساوي سوف يتغير سريعا”.
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