Nick Jr. Noobian Union is a network made by Viacom. It first launched in 1996 as a block on Nickelodeon along with the channel in 1997.
Nick Jr. Block
In June 1996, the Nick Jr. block launched in the Noobian Union and Nickelodeon extended its hours to 06:00-21:00 (15 hours). It aired in three 120 minute segments in the morning (07:00-09:00), afternoon (14:30-16:30) and evening (18:00-20:00). After that it aired in one segment: from 07:00-13:00.
Nick Jr. Channel
Nick Jr. launched as a channel on May 5, 1997.