Sayed sistani says that women can’t do moonsighting

“However, sighting of the new moon is not recognised by the evidence of women, or by the evidence of one just witness, even with oath, or by the words of astrologers”

Can you please explain on where this comes from (Hadith) if you can give a source please, also is this the agreed upon opinion by all Shia scholars?

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Please see this:
والمراد بهذه الروايات نفي الحجّيّة الشرعيّة عن شهادة النساء وقبول قولهنّ تعبّداً على النحو الذي كان ثابتاً في الرجال ، وأمّا إذا بلغ إخبارهنّ حدّ التواتر بحيث لا يحتمل معه التواطؤ على الكذب أو حدّ الشياع المفيد للعلم فلا ينبغي التأمل في عدم كونه مشمولا لتلك النصوص ، فإنّها ناظرة إلى النهي عن العمل بشهادة النساء ، لا عن العمل بالعلم الوجداني كما هو واضح

A collection of prestigious texts expressing this, including Sahih Al-Halabi on the authority of Imam Sadiq (pbuh): “Ali (pbuh) used to say: Only the testimony of two just men is permitted in the Crescent.”

And Sahih Muhammad bin Muslim: “He said: It is not permissible for women to testify on the crescent.”

And the narration of Shuaib bin Ya’qub, on the authority of Imam Jaafar, on the authority of his father (pbuthem): “Ali (pbuh) said:“ No divorce or the Crescent is permitted except for two men", and similar narrations.

Sayed sistani says that women can’t do moonsighting

“However, sighting of the new moon is not recognised by the evidence of women, or by the evidence of one just witness, even with oath, or by the words of astrologers”

Can you please explain on where this comes from (Hadith) if you can give a source please, also is this the agreed upon opinion by all Shia scholars?

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We have two points here:

1- Bayyina, which means Islamically binding evidence that’s acceptable in an Islamic court. This usually came in the form of 2 just male witnesses. If two just men testify they saw the moon, then that’s sufficient Islamic evidence (even if we don’t have certainty that they are accurate). We have hadiths that state the witnesses must be male, such as this hadith in the book of Kafi, vol. 4, p. 76:

عن أبي عبدالله (عليه السلام) إن عليا (عليه السلام) كان يقول: لا أُجيز في الهلال إلا شهادة رجلين عدلين.

Also this hadith in al-Kafi that states the testimony of women is not accepted:

عن أبي عبدالله (عليه السلام) قال: قال أمير المؤمنين (عليه السلام): لا تجوز شهادة النساء في الهلال، ولا يجوز إلا شهادة رجلين عدلين

There are numerous reasons why this is the case.
https://youtu.be/6XygMtbeLuA

Please see at 10 minutes and onwards for some of those reasons.

2- Confidence. If women see the moon and we are confident or certain they are truthful and accurate, then this certainty is sufficient and we can accept their sighting of the moon.