Nickelodeon is a worldwide cable television network. Airing Sundays-Fridays from 7 a.m.-8 p.m. and Saturdays from 7 a.m.-9 p.m. It is made for children. The network was started in 1977 as Pinwheel. During the late mornings and afternoons, Nickelodeon shows Nick Jr.. This is a group of learning programs and series for younger children. They are shown while the older children are in school. At night, the network shows Nick at Nite. Nick at Nite is a group of reruns of older series that parents watched when they were younger.