Bismillah ar-Rahman ar-Raheem
Assalam Alaikum wa Rahmatullah wa Barakatuh
يا علي (عليه السلام) مدد
A Partial Solar Eclipse will be visible for those residing in the UK on Monday 21 August 2017.
In London, the Partial Eclipse begins at 19:40 (7:40pm) with maximum eclipse at 20:04 (8:04pm). Partial Eclipse ends at 20:28 (8:28pm).
Method of Offering Namaz-e-Ayaat
1516. Namaz-e-Ayaat consists of two Rak'ats, and there are five Ruku in each. Its method is as follows: After making niyyat of offering the prayers, one should say takbir (Allahu Akbar) and recite Surah al-Hamd and the other Surah, and then perform the Ruku. Thereafter, he should stand and recite Surah al-Hamd and a Surah and then perform another Ruku. He should repeat this action five times, and, when he stands after the fifth Ruku, he should perform two Sajdah, and then stand up to perform the second Rak'at in the same manner as he has done in the first. Then he should recite tashahhud and Salam.
1517. Namaz-e-Ayaat can also be offered in the following manner:
After making niyyat to offer Namaz-e-Ayaat, a person is allowed to say takbir and recite Surah al-Hamd and then divide the verses of the other Surah into five parts, and recite one verse or more or less, and thereafter perform the Ruku. He should then stand up and recite another part of the Surah (without reciting Surah al-Hamd) and then perform another Ruku. He should repeat this action, and finish that Surah before performing the fifth Ruku. For example, he may say: Bismillahir Rahmanir Rahim with the niyyat of reciting Surah al-Ikhlas, and perform the Ruku. He should then stand up and say, Qul huwallahu Ahad, and perform another Ruku. He should then stand up and say, Allahus Samad, and perform the third Ruku. Thereafter he should stand up again and say, Lam yalid walam yulad, and perform the fourth Ruku. Then he should stand up again and say, Walam yakullahu Kufuwan ahad, and then perform two Sajdah and then rise for the second Rak'at, the same way as the first Rak'at. At the end, he should recite tashahhud and Salam after the two Sajdah. It is also permissible to divide a Surah into less than five parts. In that event, however, it is necessary that when the Surah is over, one should recite Surah al-Hamd before the next Ruku.
1518. There is no harm if in one Rak'at of Namaz-e-Ayaat, a person after Surah Al Hamd recites another Surah five times, and in the second Rak'at recites Surah Al Hamd, and divides the other Surah into five parts.
1519. The things which are obligatory and Mustahab in daily prayers are also obligatory and Mustahab in Namaz-e-Ayaat. However, if Namaz-e-Ayaat is offered in congregation, one may say 'As-salaat' three times in place of Adhan and Iqamah. If the prayer is not being offered in congregation, it is not necessary to say anything.
1520. It is Mustahab that the person offering Namaz-e-Ayaat should say takbir before and after Ruku, and after the fifth and tenth Ruku he should say Sami'allahu liman hamida before takbir.
1521. It is Mustahab that qunut be recited before the second, fourth, sixth, eighth and tenth Ruku, but it will be sufficient if qunut is recited only before the tenth Ruku.
1522. If a person doubts as to how many Rak'ats he has offered in Namaz-e-Ayaat, and is unable to arrive at any decision, his prayer is void.
1523. If a person doubts whether he is in the last Ruku of the first Rak'at, or in the first Ruku of the second Rak'at, and he cannot arrive at any decision, his Namaz-e-Ayaat is void. But if he doubts whether he has performed four Ruku or five, and if the doubt takes place before he goes into Sajdah, he should perform the Ruku about which he is doubtful. But if he has reached the stage of Sajdah, he should ignore his doubt.
1524. Every Ruku of Namaz-e-Ayaat is a Rukn, and if any addition or deduction takes place in them, the prayer is void. Similarly, if an omission takes place inadvertently, or, as a precaution, an addition is made to it unintentionally, the prayers will be void.
اَللَّهُمَّ صَلِّ عَلى مُحَمَّدٍ وَّآلِ مُحَمَّدٍ وَّعَجِّلْ فَرَجَهُمْْ
You can read further details on this as per the following link: http://www.telegraph.co.uk/science/2017/08/21/total-solar-eclipse-2017-time-plus-watch-uk/