Commemoration Day of Khayyam

Posted by Shaahin Bahremand (Tehran, Iran) on 15 May 2012 in Cityscape & Urban and Portfolio.

تهران - پارک لاله
مجسمه ی غیاث‌الدین ابوالفتح عمر بن ابراهیم خیام نیشابوری
تاریخ تولد : 28 اردیبهشت 427 خورشیدی در نیشابور
تاریخ درگذشت : 12 آذر 510 خورشیدی در نیشابور
دوره : سلجوقی
نقش خیام در حل معادلات درجه سوم و مطالعات‌ اش درباره ی اصل پنجم اقلیدس نام او را به عنوان ریاضی‌ دانی برجسته در تاریخ علم ثبت کرده‌ است. ابداع نظریه‌ ای درباره ی نسبت‌ های هم‌ ارز با نظریه ی اقلیدس نیز از مهم‌ ترین کارهای اوست
تدوین تقویم جلالی، رباعیات، استاد بی بدیل فلسفه ی طبیعی (مادی) ریاضیات، منطق و متافیزیک، مثلث خیام - پاسکال، چهارضلعی خیام - ساکری مهمترین کارهای خیام می باشند

Tehran - Laleh Park
The words about Khayyam are a lot.
Omar Khayyám (1048–1131‎) was a Persian polymath: philosopher, mathematician, astronomer and poet. He also wrote treatises on mechanics, geography, mineralogy, music, climatology and Islamic theology.
Khayyám is claimed to be a member of a panel that introduced several reforms to the Iranian calendar.[citation needed] On March 15, 1079, Sultan Malik Shah accepted this corrected calendar as the official Persian calendar.
This calendar was known as the Jalali calendar after the Sultan, and was in force across Greater Iran from the 11th to the 20th centuries. It is the basis of the Iranian calendar which is followed today in Iran and Afghanistan. While the Jalali calendar is more accurate than the Gregorian, it is based on actual solar transit, similar to Hindu calendars, and requires an ephemeris for calculating dates. The lengths of the months can vary between 29 and 31 days depending on the moment when the sun crosses into a new zodiacal area (an attribute common to most Hindu calendars). This meant that seasonal errors were lower than in the Gregorian calendar.
The modern-day Iranian calendar standardizes the month lengths based on a reform from 1925, thus minimizing the effect of solar transits. Seasonal errors are somewhat higher than in the Jalali version, but leap years are calculated as before.

 

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