TY - CONF AU - Neil Ashby C2 - Proceedings IAU Symposium, No. 261, Virginia Beach, VA DA - 2009-04-27 LA - en PB - Proceedings IAU Symposium, No. 261, Virginia Beach, VA PY - 2009 TI - The global positioning system, relativity, and extraterrestrial navigation UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904814 ER -