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==== इष्टिः ॥ Ishti ====

==== इष्टिः ॥ Ishti ====

It involves the oblations of havis, offered by the Adhvaryu, in a standing position to the south of the altar accompanied by utterance of  वषट्कार । Vashatkara followed by "yajyaanuvakya".(Katy. Shra. 1.2.6) <ref name=":3" /><blockquote>सवषट्कारासु तिष्ठन्दक्षिणत उदङ्प्राङ् वषट्कृते १८ (Katy. Shra. 1.9.18)<ref name=":4" /></blockquote>This class of rites, of which Darsa (one of the Haviryajnas) is the model (Prakrti) requiring four priests, is distinctly different from Homa class of rites, helped and sponsored by the yajamana and his wife.<ref name=":3" /><blockquote>दर्शपूर्णमासयोश्चत्वार ऋत्विजोऽध्वर्युर्ब्रह्मा होताग्नीध्र इति (Baud. Shra.2.3)<ref>Kashikar, C. G. (2003) ''[https://archive.org/stream/TheBaudhayanaSrauta-sutra-VedicRitualText/The%20Baudhayana%20Srauta-sutra%20-%20Vedic%20Ritual%20Text/The_Baudhayana_Srauta-Sutra_Vol_I#page/n119 Baudhayana Srautasutra, Volume One].'' Delhi : Indira Gandhi National Center for the Arts, New Delhi and Motilal Banarsidass Publishers Pvt. Ltd.</ref></blockquote>Meaning : In the Darsapurnamasa yajnas (Full moon and New moon sacrifices) there are four ritviks- Adhvaryu, Brahman, Hotr and Agnidhra.

It involves the oblations of havis, offered by the Adhvaryu, in a standing position to the south of the altar accompanied by utterance of  वषट्कार । Vashatkara followed by "yajyaanuvakya".(Katy. Shra. 1.2.6) <ref name=":3" /><blockquote>सवषट्कारासु तिष्ठन्दक्षिणत उदङ्प्राङ् वषट्कृते १८ (Katy. Shra. 1.9.18)<ref name=":4" /></blockquote>This class of rites, of which Darsa (one of the Haviryajnas) is the model (Prakrti) requiring four priests, is distinctly different from Homa class of rites, helped and sponsored by the yajamana and his wife.<ref name=":3" /><blockquote>दर्शपूर्णमासयोश्चत्वार ऋत्विजोऽध्वर्युर्ब्रह्मा होताग्नीध्र इति (Baud. Shra.2.3)<ref>Kashikar, C. G. (2003) ''[https://archive.org/stream/TheBaudhayanaSrauta-sutra-VedicRitualText/The%20Baudhayana%20Srauta-sutra%20-%20Vedic%20Ritual%20Text/The_Baudhayana_Srauta-Sutra_Vol_I#page/n119 Baudhayana Srautasutra, Volume One].'' Delhi : Indira Gandhi National Center for the Arts, New Delhi and Motilal Banarsidass Publishers Pvt. Ltd.</ref></blockquote>Meaning : In the Darsapurnamasa yajnas (Full moon and New moon yajnas) there are four ritviks- Adhvaryu, Brahman, Hotr and Agnidhra.

== Classsification of Yajnas ==

== Classsification of Yajnas ==

# '''Anga''' (Subsidiary)

# '''Anga''' (Subsidiary)

A ‘Yaga’ is made up of several rituals which has its own principal part (Pradhana). Those that form subsidiary or supplement to this are called ‘Angas’. Some of the rituals may be common to several ‘Yagas’.<ref name=":022">Radhakrishna Bhat, N. ''[http://vedicheritage.gov.in/pdf/Vedic_tradition_karnataka.pdf Vedic Ritual Tradition of Karnataka]'', Vedic Heritage Portal.</ref>

A ‘Yaga’ is made up of several rituals which has its own principal part (Pradhana). Those that form subsidiary or supplement to this are called ‘Angas’. Some of the rituals may be common to several ‘Yagas’.<ref name=":022">Radhakrishna Bhat, N. ''[http://vedicheritage.gov.in/pdf/Vedic_tradition_karnataka.pdf Vedic Ritual Tradition of Karnataka]'', Vedic Heritage Portal.</ref>

* Vedic yajnas/yagas are divided into two<ref name=":122222222">Purkayastha, Dipanjona (2014) Ph. D Thesis from Assam University : ''[http://hdl.handle.net/10603/41946 A Study of the Asvalayana srauta sutra with reference to the principal sacrifices]''</ref>

* Vedic yajnas/yagas are divided into two<ref name=":122222222">Purkayastha, Dipanjona (2014) Ph. D Thesis from Assam University : ''[http://hdl.handle.net/10603/41946 A Study of the Asvalayana srauta sutra with reference to the principal yajnas]''</ref>

# '''Prakritiyaga''' (Model)   

# '''Prakritiyaga''' (Model)   

# '''Vikritiyaga''' (Modified)   

# '''Vikritiyaga''' (Modified)   

===  विकृतियागम् ॥ Vikritiyagas ===

===  विकृतियागम् ॥ Vikritiyagas ===

The subsidiary rituals follow their respective principal sacrifices in the performance of different sacrifices. Vikriti Yaganas like Chandika Homa, Veda Samhita Svahakara Yagas, Rudra Yagas are being performed in temples.<ref name=":022" />

The subsidiary rituals follow their respective principal yajnas in the performance of different yajnas. Vikriti Yaganas like Chandika Homa, Veda Samhita Svahakara Yagas, Rudra Yagas are being performed in temples.<ref name=":022" />

In the context the kindling of fire, the Agnihotram mentioned as nitya karma has been discussed here and only a brief mention of Agnihotram as a part of vedic ritual during different occasions has been made.  

In the context the kindling of fire, the Agnihotram mentioned as nitya karma has been discussed here and only a brief mention of Agnihotram as a part of vedic ritual during different occasions has been made.  

* For Agnihotram : Milk

* For Agnihotram : Milk

* For Isthi : Purodasa

* For Isthi : Purodasa

* For Pasu : Pasu sacrifice (goat). Aswamedha yaga - horse.

* For Pasu : Pasu yajna (goat). Aswamedha yajna - horse.

* For Soma yagas : Soma juice

* For Soma yagas : Soma juice

Cooking of the havis may be done on either garhapatya or ahvaniya according to one's sutra.   

Cooking of the havis may be done on either garhapatya or ahvaniya according to one's sutra.   

=== श्रौतसुत्राणि॥Shrauta Sutras ===

=== श्रौतसुत्राणि॥Shrauta Sutras ===

Kalpas are one among the [[Shad Vedangas (षड्वेदाङ्गानि)|Shad Vedangas]]. Shrautasutras classified as one among the Kalpas deal with the rules for the execution of the great yajnas (sacrifices) which last for many days. All the four Vedas have their Shrautasutras.<ref name=":122222222" />

Kalpas are one among the [[Shad Vedangas (षड्वेदाङ्गानि)|Shad Vedangas]]. Shrautasutras classified as one among the Kalpas deal with the rules for the execution of the great yajnas which last for many days. All the four Vedas have their Shrautasutras.<ref name=":122222222" />

{| class="wikitable"

{| class="wikitable"

!Vedas

!Vedas

External rituals are physical, in which visible dravyas such as milk and ghee are offered to devatas.   

External rituals are physical, in which visible dravyas such as milk and ghee are offered to devatas.   

Internal rituals are mental or spiritual, in which the mind and the senses are withdrawn and engaged in contemplative or meditative practices, which culminated in self-absorption. In the internal rituals, the sacrificial model is internalized or visualized by mind by a process called Parikalpana. The mind and the body become the field or the sacrificial pit, breath becomes fire, whatever that is offered to the body such as food or pleasure becomes the offering. As man moves above in the series of ashramas from grihasta to vaanaprastha, the elaborateness of the yagas also decrease.   

Internal rituals are mental or spiritual, in which the mind and the senses are withdrawn and engaged in contemplative or meditative practices, which culminated in self-absorption. In the internal rituals, the yajnika model is internalized or visualized by mind by a process called Parikalpana. The mind and the body become the field or the yajnika pit, breath becomes fire, whatever that is offered to the body such as food or pleasure becomes the offering. As man moves above in the series of ashramas from grihasta to vaanaprastha, the elaborateness of the yagas also decrease.   

Aranyakas deal with a form of meditative yajnas wherein water is offered in place of milk as a substitute for it.   

Aranyakas deal with a form of meditative yajnas wherein water is offered in place of milk as a substitute for it.   

== Importance of Yajnas ==

== Importance of Yajnas ==

In physical terms, Yajna (होम | homam, हवन | havan or अग्निहोत्र | agnihotra) is a process of herbal sacrifices in holy fire aimed at the finest utilization of the subtle properties of sacrificed matter with the help of the thermal energy of fire and the sound energy of the mantras. Modern scientific research has also shown significant therapeutic applications of Yajna and also affirmed its potential in purification of environment. 

In physical terms, Yajna (होम | homam, हवन | havan or अग्निहोत्र | agnihotra) is a process of herbal offerings in holy fire aimed at the finest utilization of the subtle properties of offered matter with the help of the thermal energy of fire and the sound energy of the mantras. Modern scientific research has also shown significant therapeutic applications of Yajna and also affirmed its potential in purification of environment. 

Literally speaking, Yajna means - selfless sacrifice for noble purposes. Sacrificing ego, selfishness and material attachments and adopting rational thinking, humane compassion and dedicated creativity for the welfare of all - is indeed the best Yajna which should be performed by all human beings. The philosophy of Yajna teaches a way of living in the society in harmony, a living style to promote and protect higher humane values in the society - which is indeed the basis of the ideal human culture.

Literally speaking, Yajna means - selfless sacrifice for noble purposes. Sacrificing ego, selfishness and material attachments and adopting rational thinking, humane compassion and dedicated creativity for the welfare of all - is indeed the best Yajna which should be performed by all human beings. The philosophy of Yajna teaches a way of living in the society in harmony, a living style to promote and protect higher humane values in the society - which is indeed the basis of the ideal human culture.