The Total and Spectral Solar Irradiance Sensor (TSIS-1), first selected in 1998 for the National Polar-orbiting Operational Environmental Satellite System (NPOESS), re-manifested in 2010 on the NOAA-NASA Joint Polar Satellite System (JPSS), then the NOAA Polar Free Flyer, is now scheduled to launch to the International Space Station in November 2017.