The following is from our Zarathushtri prayer books in Gujarati and English.
Master sequence of prayers:
First, take a bath, or wash the hands and feet and face. With a cap or scarf on your head, and facing the sun or light, but without facing North at any time, pray the Ashem, Yatha, Kemna Mazda, then remove the Kusti from your waist. Pray AhuraMazda Khodae, at this time start tying Kusti, finish tying Kusti, Mazdayasno ahmi, Sarosh Baj, Ahmai Raeshcha, Hazangrem, Jasemeavanghe Mazda, Kefreh Mazda, then the appropriate Geh, then the Farajyat (compulsary) prayers like Khorshed and Meher Nyaishes (only in the first three Gehs), Atash Niyaesh, Hormuzd Yasht, and then Ardibehest Yasht.
A detailed guideline for each Geh follows. Note that the most prayers are recommended in the first Geh, Havan, and this includes the Ardibehest Yasht. The Havan Geh is therefore the best time to pray this Yasht.
Havan Geh (Sunrise to 12:40 PM)
Getting up before sunrise, pray the Hoshbam. When the sun rises, start the master sequence above. Continue with Khorshed, Meher Nyaishes, Vispa Humata, Atash Niyaesh, Hormuzd Yasht. If possible, also pray the Big Haptan Yasht, Ardibehest Yasht, Sarosh Yasht Hadokht and Vanant Yasht. Then the Doa Nam Sataishne, Char Dishano Namaskar, Duva Tandorosti, and Din-no-kalmo.
Rapithavan Geh (12:40 to 3:40 PM)
Start the master sequence above. If possible, continue with Sarosh Baj, Rapithavan Geh, Khorshed, Meher, Atash Niyaeshes, Doa Nam Sataishne, Char Dishano Namaskar, Duva Tandorosti, and Din-no-kalmo.
Ujiren Geh (3:40 PM to sunset)
Start the master sequence above. If possible, continue with Sarosh Baj, Ujiren Geh, Khorshed, Meher, Ava Ardvisur and Atash Nyaishes, Doa Nam Sataishne, Sarosh Yasht Hadokht, Char Dishano Namaskar, Duva Tandorosti, and Din-no-kalmo.
Aiwisuthrem Geh (sunset to 12:40 AM)
Start the master sequence above. IF POSSIBLE, continue with Sarosh Baj, Aiwisuthrem Geh, Cheragno Namaskar (homage to the lamps), Mah Bokhtar (homage to the moon), Atash Niyaesh, Sarosh Yasht Vadi, Doa Nam Sataishne, Duva Tandorosti, and Din-no-kalmo.
Ushahin Geh (12:40 AM to Sunrise)
Start the master sequence above. IF HEALTH ALLOWS, continue with Sarosh Baj, Ushahin Geh, Atash Niyaesh, Doa Nam Sataishne, and if possible Hormuzd Yasht, Ardibehest Yasht, Sarosh Yasht Hadokht, Duva Tandorosti, and Din-no-kalmo.
Ava Yasht - if not possible daily, then pray on these days every month: Asfandarmad, Ava, Din, Ashishvangh, Marespand.
Atash Niyaesh - if not possible daily, pray on these days: Hormuz, Ardibehest, Ader, Sarosh, Behram roj.
From the first month of Farvardin to the month of Meher, the first roj Hormuz to the last roj Aneran of these months, pray the Rapithavan Geh in its time slot. But from the Month Ava to the Vahistohist Gatha day, ie. 5 months 5 days, pray the Havan Geh instead.
Also note that Khorshed and Meher Nyaishes are to be recited during the Havan, Rapithven and Uziren Geh only, Vispa Humata during Havan Geh only, Mah Bokhtar Niyaesh during Aiwisuthrem Geh, and during any Geh of the day. Nemaz-i-chehar-disa during Havan, Rapithven and Ujiren. Ardvisur Niyaesh during Havan, Rapithven and Ujiren. Sarosh Yasht Hadokht during Havan, Ujiren and Ushahin. Sarosh Yasht Vadi during Aiwisuthrem Geh only. Patet Pashamani and Stom Karta during any Geh.
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