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موضوع: Sighting The Moon Crescent

  1. Top | #1
    کاربر فعال

    عنوان کاربر
    كاربر فعال آوااستار
    مدال طلاي كشوري المپياد نجوم
    مدال برنز جهاني المپياد نجوم
    تاریخ عضویت
    Feb 2011
    شماره عضویت
    567
    نوشته ها
    53
    تشکر
    304
    تشکر شده 400 بار در 48 ارسال

          Sighting The Moon Crescent

    Sighting the moon crescent
    How is the first day of a month in the Lunar calendar determined?
    You may think about so accurate softwares of these days and their predictions of the moon position of every time in every where! It is true,but there is another condition that the new month in Lunar Calendar starts, and this condition is just sighting the crescent of the young moon!
    This action is most common on Islamic countries or lands which Lunar calendar is used.In Iran also there are some sites and people who work on it especially at the beginning of more important months like Ramadan and etc.
    Observation of this fade,thin crescent is so hard and some times needs expert equipments and very fast time reaction(because moon is so close to fall under horizon!)There are some records for this action too!
    Here is a photo of such a crescent(reference is here: http://www.flickr.com/photos/marubozo/5688570463/)

    there is a question for myself:
    If only seeing this crescent is the condition,how can we make sure that our equipments are strong enough to visit this valuable arc and there is a bug!because we can make these instruments as powerful as we want and maybe one day we can observe a crescent with our 30 inches telescope(!) that the other before days we just couldn't!so are the previous beginning of months wrong?!!
    تصاویر کوچک فایل پیوست تصاویر کوچک فایل پیوست Sighting The Moon Crescent-1-jpg  
    امضای ایشان
    You do not really understand something unless you can explain it to your grandmother!Albert Einstein

  2. 12 کاربر مقابل از Fowad عزیز به خاطر این پست مفید تشکر کرده اند.


  3. Top | #2
    کاربر فعال
    مدیر تالار

    عنوان کاربر
    ديوان سالار ويكی نجوم
    تاریخ عضویت
    Sep 2011
    شماره عضویت
    1479
    نوشته ها
    1,068
    تشکر
    14,157
    تشکر شده 11,960 بار در 1,080 ارسال

          Seeking Thin Crescent Moons

    Seeking Thin Crescent Moon


    Few celestial sights are as beautiful as a slender crescent Moon in the western evening sky, the day after it passes the Sun each month. A good-luck token for some, a bad-weather omen for others, it is also a sight that regulates the lunar calendar of the Muslim world




    Photo by : Youssef M. Ismail

    For amateur astronomers and photographers alike, each young Moon makes an inviting target. The sunlit part encircles the Moon’s night side, which is not fully dark but is bathed in sunlight reflected back toward the Moon from Earth. This earthshine theoretically gets brighter the closer the Moon is to new, except that it can easily be washed out by twilight. On rare occasions it has even been seen during a total solar eclipse


    To get more information check this link
    ویرایش توسط هانیه امیری : 06-18-2012 در ساعت 01:18 PM
    امضای ایشان
    وقتی خدا را دیدم که مشکلم را حل می کرد، من به توانایی او ایمان می آوردم

    و وقتی حل نمی کرد


    می فهمیدم او به توانایی من ایمان دارد...


  4. 12 کاربر مقابل از هانیه امیری عزیز به خاطر این پست مفید تشکر کرده اند.


  5. Top | #3
    کاربر ممتاز

    عنوان کاربر
    کاربر ممتاز
    تاریخ عضویت
    Nov 2010
    شماره عضویت
    386
    نوشته ها
    922
    تشکر
    5,844
    تشکر شده 8,390 بار در 879 ارسال

    discussing about different ways of lunar crescent observing is an important .islamic subject which has ancient history in iran

    also Its importance endures today, since the Hijra Lunar Calendar is still
    organized according to the rules or criteria for lunar crescent visibility in
    ...different Muslim countries

    thus I want to share a very good article in which will analyze two tables for determining lunar crescent visibility, included in al-Khāzinī’s Sanjarī Zīj


    this article has been written with Hamid-Reza Giahi Yazdi & can be seen here



  6. 10 کاربر مقابل از Sunrise عزیز به خاطر این پست مفید تشکر کرده اند.


  7. Top | #4
    کاربر ممتاز

    عنوان کاربر
    کاربر ممتاز
    تاریخ عضویت
    Jan 2011
    شماره عضویت
    487
    نوشته ها
    237
    تشکر
    135
    تشکر شده 2,517 بار در 229 ارسال

    Sighting The Moon Crescent         
    About six years ago, I and my colleagues wrote a book about lunar crescent sighting in Persian.
    In the following text I have tried to introduce this book

    New moon (Scientific Principles of Lunar Crescent Sighting
    by Amir Hasanzadeh, Mohammad Ahmadi, Yoosef Shabani


    In recent years we have witnessed good progress in crescent observation. But a major problem is lack of a scientific book in this field to guide observers and inform them well about this kind of observations. Solving this problem is the purpose of authors of this book.
    The writers that are members of North Star Scientific Research Institute (www.NSSRI.ir) decided to write a book on principles of crescent observation. This book tries to increase society knowledge about crescent observation in scientific words.
    The book has set up in 8 chapters in addition to attachments and pictures section. In the first chapter you can read about spherical astronomy that is prerequisite of other chapters. In chapters 2 and 3 moon’s structure and orbit are under discussion. In chapter 4 readers learn crescent observation’s terminology and in chapter 5 about lunar Hijri calendar. In chapter 6 and 7, records and crescent visibility criteria are comprehensively specified and in the last chapter how to observe a lunar crescent.
    One of the attachments specifically talks about the islamic jurisprudence (Shia fiqh) of crescent observation which is Compiled and arranged by Dr. Alireza Movahednejad.

    Islamic research Institute of Astan-e Qods -e Razavi (www.islamic-rf.ir) published it in 1387 SH (2008). This book published in 2011 for the second time.

  8. 7 کاربر مقابل از امیر حسن زاده عزیز به خاطر این پست مفید تشکر کرده اند.


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