Garga Hora

Garga was the chief astrologer of King Prithu. He had obtained astronomical knowledge from Ananta.

https://en.wikipedia.org/wiki/Garga_Hora

jyoti
http://www.astrojyoti.com/gargahora.htm

PDF 

1. http://cincinnatitemple.com/articles/GargaHora.pdf
2. http://www.astrovidya.com/Garga%20Hora.pdf

Blog
http://vipasana-vidushika.blogspot.in/2014/02/sages-from-hindu-scriptures-rishi-garga.html

Tube
https://www.youtube.com/results?search_query=Gargeya

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=garga+hora

Tree
http://www.speakingtree.in/search/garga

Also

https://www.google.com/search?q=shesha+garga+samhita