Prospects for Ground-based Terahertz Astronomy from Cerro Sairecabur by Dr. Scott Paine, SAO Submillimeter Receiver Laboratory.   Abstract: In 1997, we began a program of measurements of zenith atmospheric transmission, in the frequency interval 300 GHz - 3 THz, from sites in northern Chile. The goal of this work has been to evaluate prospective sites for ground-based radio astronomy at frequencies above 1 THz. In October 2000, we established a measurement station at 5525 metres altitude on Cerro Sairecabur, about 40 km NNW of the ALMA site at Chajnantor, where our equipment had been installed previously. The data from Sairecabur confirm that atmospheric conditions, suitable for observations in the atmospheric windows centered at 1.03, 1.3 and 1.5 THz, occur a substantial fraction of the time. I will present our results from Sairecabur, and a comparison with Chajnantor. The next stage in this effort, a 0.8 m test telescope for trial astronomical observations, is currently under development in the receiver lab. I will present an update on our progress with this instrument.