«Recently, architects and urban planners have started to consider the abilities and reference frames of those using the space to optimize the design of the built environment,» they said. (sciencedaily.com)
It says that the faster mass moves relative to another mass the time frame slows down relative to the other slower moving reference frame. (religion.blogs.cnn.com)
«Devising stable geometrical reference frames for use in geodetic studies of vertical crustal motion.» (polenet.org)