Ισημερία είναι εκείνη η ημέρα όπου η ημέρα έχει ακτιβώς την ίδια χρονική διάρκεια με τη νύχτα.Στη Γη υπάρχουν 2 ησιμερίες κάθε χρόνο:Την εαρινή ισημερία που ορίζεται στις 21 Μαρτίου και την φθινοπωρινή ισημερία που ορίζεται στις 23 Σεπτεμβρίου.
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Ισημερία είναι εκείνη η ημέρα όπου η ημέρα έχει ακτιβώς την ίδια χρονική διάρκεια με τη νύχτα.Στη Γη υπάρχουν 2 ησιμερίες κάθε χρόνο:Την εαρινή ισημερία που ορίζεται στις 21 Μαρτίου και την φθινοπωρινή ισημερία που ορίζεται στις 23 Σεπτεμβρίου.