Basic calculator output for Earth. The green lines show the location of the HZ at present, the solid red and solidblue lines show the location of the HZ at the beginning of the star’s lifetime, and the dashed red and blue lines show the locations of the inner and outer boundaries, respectively, at the end of the star’s main sequence lifetime. (The star is not to scale!).
L = luminosity
ZAMS = Zero age main sequence
TMS = Terminal main sequence
MSL = main sequence lifetime
e.g. 'Inner' = Inner boundary of habitable zone in AU (astronomical units)