Multiple choice general knowledge

Which is a measurement of time relative to a distant star?

  1. Ephimerus

  2. Caesium

  3. Sidereal

  4. Timilithic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sidereal time is measured relative to distant stars (fixed points far beyond our solar system). A sidereal day is about 23 hours 56 minutes and 4 seconds - Earth's actual rotation period. An ephemeris is a table of celestial positions. Caesium is used in atomic clocks. 'Timilithic' appears to be a made-up word.

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