It is believed that Sage Vikhanasa was created from the mind (Maanaseeka Udbhava) of Sriman NarayaNa, when many sages were reluctant to engage in the performance of AarAdhanam for Him in bhU lOkam because they were unsure of doing the right kind of ArAdhanam. They had no clue. Sriman NarAyaNa through viSEsha khananam (digging) created a new sage,named him VikhAnasa and empowered him to perform ArAdhanams for Him in His Vibhava and archAvatArams through upadEsams on Veda, VedAntams and initiation into Gayatri/Saavitri mantrams.
Sage Vikhanasar arrived at NaimisAraNyam, where the Lord is present as a Forest. He arrived there withhis Nine sishyAs, Atri, Brughu, Mareechi, Kasyapa, Vasishta, Pulaha, Pulashtya Krathu and Angiras in the time of Swayambhuva (The 1st one)Manvantaram, Sukla Paksham, SrAvana Pournami, Monday, Simhalagnam with star of Sravanam according to Sage MarIchI's Ananda SamhitA.
Among them four sishyas Atri, Bhrigu, Marichi and KAsyapa has written the major portion of…
trimurtinam yadha Vishnuh sivananutu sadasivah I
dharmanam Vaishnavo dharma smritinam manava smritih
vipranam vedavidusham yadha Vaikhanaso varah I
sutranam tatpranitantu yatha srestatamam smritam II
Just like the Vishnu among the Trimurthis, Sadasiva among the Sivas, Vaishnava dharma among the dharmas, Manusmriti among the smritis, among the Barahmins, erudite vedic scholors are great; so too among the Kalpasutras, the Vaikhanasa Kalpasutras are great.