The Circle of illumination is the

  1. Position of  the  Sun  on  a  particular meridian ;it 12 :00 o’clock in noon
  2. Circle that divides the globe into two parts
  3. Circle that divides the day from night on the globe
  4. Position of the earth on equinox when day and night equal
Monis Rasool Professor Asked on 3rd January 2016 in Science.
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    Answer: (4) Position of the earth on equinox when day and night equal 

    Anurag Mishra Professor Answered on 3rd January 2016.
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