Question

Which of the following does not identify a unique date for which the celestial co-ordinates of the Sun can be determined? Vernal equinox Full Moon Autumnal equinox Summer solstice

Answer 1

Answer:

Full Moon

Explanation:

Full Moon does not have a fix or defined date , like some other celestial bodies .

But the rest options , i.e. , Vernal equinox occurs at March 21 every year , similarly ,

Autumnal equinox - September 22  every year

and  

Summer solstice - June 21 every year ,

hence , the correct answer to statement given in the question is Full Moon .