sidereal

/saษชหˆdษชษนi.ษ™l/

IPA: /S IH1 D IH1 R IY0 AH0 L/

adjective
  1. 1

    Of or relating to the stars.

  2. 2

    Relating to a measurement of time relative to the position of the stars.

  3. 3

    Relating to a measurement of time relative to the point of the vernal equinox.

Source: https://en.wiktionary.org/wiki/sidereal