sidereal day
one day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox
en-US/saɪˈdiɹiəl ˈdeɪ/
en-GB/saɪˈdɪəɹɪəl ˈdeɪ/
one day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox