Hubble time dilation

The Hubble time dilation is an effect of accumulation of time dilation with distance from observer so for small distances it looks roughly propotional to the distance. The exact effect is $d\tau /dt=exp(-r/R_{s})$, where $\tau$ is proper time at point in deep space, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle t} is coordinate time of the point, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle r} is distance to this point from observer, and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle R_s} is radius of curvature of space (called by cosmologists "Einstein's radius").