The Haramain will witness a Lunar Eclipse tomorrow night, when an eclipse occurs . Muslims are recommended to pray the Khusoof Prayers (Lunar Eclipse Prayers)
Salat Al Khusoof and Salat Al Kusuf or Lunar Eclipse and Solar Eclipse Prayer are one of the Sunnah Prayers offered by the Prophet صلى الله عليه وسلم
"The Sun and Moon do not eclipse because of the death or life (i.e birth) of someone. When you see the eclipse pray and invoke Allah" (Sahih Al Bukhari, 2.153)
Sometimes a Prior Announcement is made a day before usually in Masjid Al Nabawi, after Salat Al Isha by the Imam explaining the importance of prayer and how to perform it.
On the day of the prayer, the Muadhin Announces that the following prayer is going to be held in Congregation
Narrated Abdullah bin Amr : “When the sun eclipsed in the lifetime of Allah’s Apostle an announcement was made that a prayer was to be offered in congregation.” [Sahih Al Bukhari,
2.155]
The Muadhin says in Arabic: صلاة الجامعه ، صلاة الجامعه ، صلاة الخسوف يرحمكملله
Translating in English: Congregation Prayer, Congregation Prayer, Lunar Eclispe Prayer May Allah Bless you
The Imam then starts the prayer, the prayer consists of two rakahs (two units). The difference between normal Salah and the Eclipse prayer is that in each Rakah the Imam reads the Quran two times, one normally after Surah Al Fatiha and one after Standing up from Ruku. The Imam then concludes the prayer normally. After the Salah a Imam delivers a short sermon regarding the importance of prayer and addresses the current situation of the Muslim Ummah and asks for Forgiveness from Allah
Tomorrow the prayers will be established at 9 PM ان شاءالله