Have you ever wondered why women see the Karwa chauth moon through sieve only? Well, there are many old beliefs behind this particular ritual. According to a strong belief in North India, this is the moon of Kartik and is form of Lord Shiva and his only son Lord Ganesha.
And in North India, it is considered essential for the women to always be in 'ghoonghat' (cover their face) in front of the elders. So, it is a kind of respect to the Karwa Chauth moon that married women pay.
While it is also believed that it is a prayer to the Karwa chauth moon to show its filtered rays. The filtered rays signify the blessings of only happiness and good in life. So, now you know the secret of sieve. A happy Karwa chauth to all.