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بهزاد پاکروح - چهارشنبه شب شب یلداست نه سه شنبه شب!

چهارشنبه شب شب یلداست نه سه شنبه شب!

چهارشنبه 1 دی 1395  02:32 ق.ظ

چهارشنبه شب شب یلداست نه سه شنبه شب!

کوتاهترین روز سال در نیمکره شمالی معمولا در تاریخ ۲۱ دسامبر هر سال است؛
اما در تقویم یک سال را ۳۶۵ روز در نظر می گیرند و هر ۴ سال، یک سال را به عنوان سال کبیسه ۳۶۶ روزه لحاظ می کنند (یک سال خورشیدی ۳۶۵.۲۴۲۲ روز است) بر این اساس، طولانی ترین روز سال ممکن است در سالهای مختلف در تقویم جابه جا و در ۲۰، ۲۱، ۲۲ یا ۲۳ دسامبر واقع شود.

البته با احتمال اندک برای ۲۰ و ۲۳ دسامبر؛  مثلا آخرین سالی که انقلاب زمستانی در ۲۳ دسامبر بوده، سال ۱۹۰۳ میلادی است و تا سال ۲۳۰۳ نیز این اتفاق رخ نخواهد داد.

امسال انقلاب زمستانی
(winter solstice)
در چهارشنبه ۲۱ دسامبر ساعت ۱۰:۴۴ به وقت گرینویچ (ساعت ۱۴:۱۴ به وقت تهران) رخ می دهد،
در نتیجه چهارشنبه کوتاهترین روز سال و شبِ آن بلندترین شبِ سال خواهد بود.

مقایسه طول روز در تهران در روزهای مختلف امسال، بر اساس طلوع و غروب خورشید:
سه شنبه ۲۰ دسامبر
۹:۴۴:۲۶
چهارشنبه ۲۱ دسامبر
۹:۴۴:۲۴
پنجشنبه ۲۲ دسامبر
۹:۴۴:۲۵
(در سایر شهرهای نیمکره شمالی هم چهارشنبه کوتاهترین روز امسال و چهارشنبه شب بلندترین شب سال است)
- - -
یک علت فراوانی اشتباه در اعلام شب یلدا، کپی برداری از روی دست همدیگر است؛ کافیست یکی اشتباه کند! اکثرا آن اشتباه را تکرار می کنند.
همین داستان در مورد ساعت تحویل سال ۱۳۹۶ هم وجود دارد که قبلا درباره آن مطلبی نوشته ام:
https://telegram.me/andishehsarapub/1106

بهزاد پاکروح

مطلب را در اولین فرصت تکمیل خواهم کرد:
https://telegram.me/andishehsarapub/1127


نوشته شده توسط: بهزاد پاکروح | آخرین ویرایش:چهارشنبه 1 دی 1395 | نظرات() 

برچسب ها: شب یلدا ، چهارشنبه ، سه شنبه ، کدام درست است ، سه شنبه یا چهارشنبه ، 30 ، 1 ،
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