Lighting of Lemon Lamps to Goddess Durga
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We should cut the lemon which has to be offered to goddess Durga only in Rahu kala. We should not cut and keep it ready before Rahu Kala. This pooja can be done on Tuesdays and Fridays. 3 Ripe yellow lemons have to be taken and cut into equal halves. When you cut 3 lemons, you get 6 pieces(6 halves), one is offered to Ganapati(Lord Ganesh) who had been given the boon by Goddess Parvati (Shakti and Durga are the forms of Goddess Parvati) that he will always get the privilege of being worshiped first before any Gods and Goddesses.
So one piece of the lemon lamp is offered to Lord Ganesha and the remaining 5 pieces to Goddess Durga. We must remember that the number of lemon lamps lit for the Devi have to be always Odd Numbers, so 1, 3 5, 7 or 11 as per how you pray to the Goddess. The juice should be squeezed out completely. Then the half lime should be turned inside-out (inverted) and the fruit inside to be scooped out, making a cup like structure where you can pour oil or ghee.
Sometimes, the outer skin of the lemon might create a whole in center which must not be used. Due to this, it is always better to buy extra lemons. Now introduce a thread or a wicker or a ball of cotton shaped with a wicker on top and fill the lemon with ghee or oil and lit the same. Place the lemon lamp at the place allotted for keeping lemon lamps in the temple and bow to the Goddess.